FORM 2
The Patent Act 1970
(39 of 1970)
&
The Patent Rules  2005

COMPLETE SPECIFICATION
(SEE SECTION 10 AND RULE 13)

TITLE OF THE INVENTION

“A method and system for reselection to LTE cell from GSM cell”

APPLICANTS:

Name : Samsung India Software Operations Pvt Ltd

Nationality : Indian

Address : Bagmane Lakeview  Block B  No. 66/1 
Bagmane Tech Park  CV Raman Nagar 
Byrasandra  Bangalore- 560093

The following specification particularly describes and ascertains the nature of this invention and the manner in which it is to be performed:-

FIELD OF INVENTION
[001] The present invention relates to wireless communications and more particularly relates to reselection procedures in GSM  UMTS and LTE technologies.

BACKGROUND OF INVENTION
[002] With the rapid development of wireless technology  wireless communication and personal mobile communication has become an integral part of everyday life. Global system for mobile communication (GSM) is one of the most commonly used communication systems in the world. The widespread use of GSM cellular phones allows an easier and more convenient way of communication. Within the communication range  a user can talk to others anytime they need regardless of their current locations.
[003] A wireless communication system comprises a plurality of cells that provide communication services. These cells are called cellular wireless communication systems. A base station (BS) provides communication services within the cell and the user equipment (UE) located within the service range of the cell. Usually  the UE chooses the base station that is capable of providing stronger signals as its serving cell and camps on to the serving cell. When the movement of the UE causes a certain degree of change in the signal strength of the serving cell  then the UE executes a confirming step of the current serving cell it is camping on and reselects to a neighbor cell that provides a better signal strength. The reselection procedure helps a UE to camp on to a best cell which can provide normal service.
[004] Wireless technologies have broadcast information  which conveys neighbor cell information to the UE. These neighbor cells can belong to same radio access technologies (RATs) or different RATs. This information is used by the UE to reselect a better cell on same RAT or in a different RAT. This neighbor cell information is conveyed through system information messages  which are periodically broadcasted in a cell by the network. Sometimes operator also provides priority to RATs  and so priority based reselection can help UE to camp on the RAT which has the highest priority as per operator.
[005] With introduction of Long Term Evolution (LTE)  legacy RATs like UMTS and GSM needed to make some changes in order to accommodate smooth transition to LTE. This includes introducing LTE neighbor cell information in System information (SI) of UMTS and GSM so as to facilitate reselection from legacy RATs to LTE.
[006] While LTE neighbor cell information in UMTS is provided in system information block 19 (SIB19)  the same is provided in SI2Quarter in GSM. Further  some network vendors have not made the necessary changes in GSM network to accommodate the GSM to LTE reselection. The UMTS networks have already made necessary changes where UMTS is spread  making UE reselect to LTE through UMTS. There are few existing systems which try to provide solutions for reselection to LTE in case UE is already in GSM.
[007] In an existing system  UE reselects from GSM to UMTS and then from UMTS to LTE on the basis of priority based reselection. UE exploits the information which is provided by SIB19 in UMTS network to reselect from GSM to LTE. In this scenario  there may be a chance that UMTS neighbor will be in bad radio conditions and is not suitable for reselection from GSM to UMTS. During these conditions  UE would use GPRS and EGPRS for its data rather than LTE even if a LTE cell exists in the vicinity. Even if UE reselects to UMTS  it needs to register on the network using Location Area Update procedure so as not to miss any paging. Further  UE starts its priority based cell reselection in case SIB19 is provided for reselecting to LTE. While the advantage of registering on the network gives assurance of not missing any paging in UMTS  there is still a signaling overhead when UE reselects from GSM to LTE through UMTS.
[008] In another existing system  UE tries to periodically search for highest priority RAT when camped on GSM. In this case  UE performs unnecessary scans causing battery loss. In case where there are many bands supported by LTE PLMN  this poses a significant loss to the battery life of the UE/device. Moreover  UE may miss paging in case of foreground scans and in case of background scans UE may find it difficult to steal sleep cycles to conserve battery power.
[009] In the light of above discussion  there is a need for a method that reduces signaling overhead and batter power of UE in reselection to LTE from GSM when system information (SI2Quarter) does not carry any LTE neighbor cell information.
OBJECT OF INVENTION

[0010] The principal object of the embodiments herein is to provide a method and system for the UE to reselect from GSM to LTE cell in absence of relevant system information.
[0011] Another object of the invention is to provide a method for UE to reselect from GSM to LTE cell directly by avoiding the registration on UMTS and reducing signaling overhead.
[0012] Another object of the invention is to provide a method for reselection from GSM to LTE cell without trying to scan for LTE cells periodically and thus saving battery life.

SUMMARY
[0013] Accordingly the invention provides a method for cell reselection to Long Term Evolution (LTE) from Global System for Mobile (GSM) by a User Equipment (UE)  wherein the method comprises detecting Universal Mobile Telecommunications System (UMTS) neighboring cells from system information (SI)  when the UE is camped on the GSM cell  searching the UMTS neighboring cells for scheduling of system information block 19 (SIB19)  reading the SIB19 information for determining the LTE neighboring cells  if the SIB19 is scheduled in the UMTS neighboring cell  initiating measurements on the LTE cell using the SIB19 information and GSM cell information and triggering the cell reselection to the LTE cell based on the measurements.
[0014] Accordingly the invention provides a user equipment (UE) to reselect LTE cell from GSM cell  wherein the UE comprises an integrated circuit further comprising at least one processor  at least one memory having a computer program code within the circuit  the at least one memory and the computer program code configured with the at least one processor cause the UE to detect Universal Mobile Telecommunications System (UMTS) neighboring cells from system information (SI)  when the UE is camped on a the GSM cell  search the UMTS neighboring cells for scheduling of system information block 19 (SIB19)  read the SIB19 information for determining the LTE neighboring cells  if the SIB19 is scheduled in the UMTS neighboring cell  initiate measurements by a controller module on the LTE cell using the SIB19 information and GSM cell information and trigger the cell reselection to the LTE cell based on the measurements.
[0015] These and other aspects of the embodiments herein will be better appreciated and understood when considered in conjunction with the following description and the accompanying drawings. It should be understood  however  that the following descriptions  while indicating preferred embodiments and numerous specific details thereof  are given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the embodiments herein without departing from the spirit thereof  and the embodiments herein include all such modifications.
BRIEF DESCRIPTION OF FIGURES
[0016] This invention is illustrated in the accompanying drawings  throughout which like reference letters indicate corresponding parts in the various figures. The embodiments herein will be better understood from the following description with reference to the drawings  in which:
[0017] FIG. 1 illustrates an overview of a wireless network and a user equipment device  according to embodiments as disclosed herein;
[0018] FIG. 2 illustrates the block diagram of a UE that includes various modules  according to embodiments as disclosed herein;
[0019] FIG. 3 illustrates a flow diagram explaining the process of reselection by a UE from GSM to LTE cell  according to embodiments as disclosed herein; and
[0020] FIG. 4 illustrates a computing environment for implementing the application  according to the embodiments as disclosed herein.

DETAILED DESCRIPTION OF INVENTION
[0021] The embodiments herein and the various features and advantageous details thereof are explained more fully with reference to the non-limiting embodiments that are illustrated in the accompanying drawings and detailed in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein can be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly  the examples should not be construed as limiting the scope of the embodiments herein.
[0022] The embodiments herein achieve a method and system for a UE to perform reselection to LTE from a GSM cell  without LTE neighbor cell information given in system information of the GSM cell or 2G cells. The method provides a time period during which the master block information (MIB) and scheduling blocks of the neighboring blocks of UMTS cells are read in order to determine the scheduling of system information block (SIB19). Once the SIB19 scheduling information is determined  the method reads SIB19 and obtains information about LTE neighboring cells. Further  if SIB19 information is not found in a particular UMTS cell scheduling information  the method does not read the cell again during next time interval. On successful SIB19 decoding  the list of neighbor LTE cells information is provided to a multimode controller within the UE. Here the multimode controller is a decision making mechanism in the UE which controls the switching between various supported RATs. The multimode controller initiates LTE RRC measurements for the frequencies and cells. Once the LTE measurements meet the required criteria  the method allows the UE to trigger reselection to LTE cell.
[0023] Referring now to the drawings  and more particularly to FIGS. 1 through 4  where similar reference characters denote corresponding features consistently throughout the figures  there are shown preferred embodiments.
[0024] FIG. 1 illustrates an overview of a wireless network and a user equipment device  according to embodiments as disclosed herein. As depicted in the figure  the user equipment (UE) 100 operates with a plurality of radio access networks. The radio access networks may comprise a GSM network  UMTS network  LTE network and so on. A radio access network covers a geographical area divided into a plurality of cell areas. Each cell area is served by at least one base station  which provides the radio link between the mobile device and the radio access network. Each cell is identified by a unique identifier which is broadcast in the cell. The base station communicates at radio frequencies over an air interface with the UEs within range of the base station. Several base stations may be connected to a radio network controller (RNC) which controls various activities of the base stations. The radio network controllers are typically connected to a core network.
[0025] GSM is a second generation (2G) public land mobile telecommunication system whereas universal mobile telecommunication system (UMTS) is a third generation (3G) public land mobile telecommunication system. Various standardization bodies are known to publish and set standards for UMTS  each in their respective areas of competence. Further  the long term evolution system (LTE) is a fourth generation (4G) public land mobile telecommunication system which is normally used for higher data rates. Across a geographical area  there may be one or more radio access networks (RANs)  each operating according to a given standard. For example  consider three radio access networks. The first radio access network serves a plurality of GSM cells 101 and the second radio access network serves a plurality of UMTS cells 102 and third radio access network comprises plurality of LTE cells 103  according to the radio access technologies GSM  UMTS and LTE respectively. The figure shows different cells of different RATs namely GSM cell 101  UMTS cell 102 and LTE cell 103. For the purpose of illustration  only few cells are shown in the figure. It will be clear to a person skilled in the art that in practice a network will include far more components than those shown.
[0026] When a UE 100 is switched on  it will attempt to select a cell to camp. It then transmits signals and receives signals from the cell on which it camps. The UE 100 also receives a broadcast list of neighboring cells and creates a neighbor cells list in its vicinity which allows UE 100 to determine with which other cell it may be capable of communicating.
[0027] From time to time  the UE 100 undertakes a cell reselection process. Cell reselection may occur for a variety of reasons e.g. because of a decrease in the quality of the signal to communicate with the cell on which UE is camped or because the cell on which it is camped is unable to provide a service which the UE 100 requires. Prior to undertaking cell reselection  the UE 100 periodically measures neighboring cells. These measurements generally give an indication of the quality of signal from a given cell. The measurements tend to be defined in various standards and may relate to the signal-to-noise ratio  signal strength  error rate and so on.
[0028] As depicted in the figure  the UE 100 is camped on a GSM cell 100. The dotted lines in the figure indicates that UE may reselect to either UMTS cell 102 or a LTE cell 103 based on its signal strength from its camped GSM cell 101. Further  if UE 100 requires high data rates  it may reselect to either UMTS cell 102 or LTE cell 103  based on priority based reselection criteria.
[0029] The method described herein provides an efficient mechanism for the UE 100 to reselect from a GSM cell 101 to LTE cell 103 without registering in the UMTS cell 102.
[0030] In an embodiment  the UE 100 can be any type of equipment such as mobile telephones (also known as cellular or cell phones)  laptops with wireless communication capability  personal digital assistants (PDAs) and so on.
[0031] FIG. 2 illustrates the block diagram of a mobile device that includes various modules for communication  according to embodiments as disclosed herein. As depicted in the figure  the user equipment 100 comprises a communication interface module 201  a controller module 202  a display module 203 and a timer module 204. The communication interface module 201 helps the UE 100 to connect to the cells namely GSM  UMTS and LTE within a network. The controller module 202 controls the functions of the UE 100. The display module 203 in the user equipment 200 comprises of a user interface which can be a keypad or through any other means by which a user can input some data into the user equipment 100. The timer module 204 calculates the elapsed time in which the UE reads the master block information (MIB) and scheduling blocks of the neighboring cells to find the scheduling of SIB19. The timer will be restarted if the UE fails to determine the SIB19 scheduling information after increasing the timer value each time there is a failure  the value of which can be defined in order to reduce the consumption of battery by the UE 100. In case  if the failure happened in reading SIB19 scheduling information after determination  the method repeats the reading of SIB19 scheduling information in the next timer interval. The maximum time interval for determining the SIB19 scheduling information can be manually adjusted according to the requirements. The timer module 204 of the user equipment 100 can be defined with a certain threshold to reduce the consumption of battery by the UE 100.
[0032] FIG. 3 is a flow diagram explaining the process of reselection by a UE from GSM to LTE cell  according to embodiments as disclosed herein. The method described herein discloses a reselection to LTE cell 103 without LTE neighbor cell information provided in the system information. Initially the UE 100 camps (301) on a GSM cell 101. When the UE 100 is camped on GSM cell 101  if the signal strength of GSM cell 101 falls  then the UE may reselect to either UMTS cell 102 or LTE cell 103. The UE 100 detects (302) the neighboring UMTS cells 102 (3G cells) from the system information. The timer module 204 within the UE 100 starts calculating the elapsed time  when UE 100 detects the neighboring UMTS cells 102 and under certain conditions which are mentioned later in the description. When the UE 100 is camped on a GSM cell 101 then the timer module 204 can be represented as 2G_SIB19_timer and can be based on SIB19 periodicity. While the above timer is running  the UE 100 checks (303) the UMTS cells 102 for scheduling of SIB19 from master information block (MIB)  system block1 (SB1) and system block2 (SB2) during discontinuous reception (DRX). Further  the UE 100 determines (304) whether the SIB19 is scheduled in the UMTS cells 102.
[0033] If the UE 100 detects that the SIB19 information is scheduled  then the UE 100 reads (305) SIB19 information to know about LTE neighbor cells. If the UE 100 finds that SIB19 is not scheduled  then the UE 100 stops (306) reading the UMTS cell 102 system information. Further  the UE 100 terminates (307) the method.
[0034] If no SIB19 scheduling information is present or if UE 100 fails to read SIB19 within timer expiry  then the method stops the timer and will restart it after a 2G_SIB19_read_block_timer which is increased in steps of 2 minutes with every failure  till 2G_SIB19_read_block_timer_MAX.
[0035] In an embodiment  if SIB19 is not present in particular UMTS cell (3G cell) scheduling information  the UE 100 does not read the cell again when 2G_SIB19_timer starts next time. In case failure happened in reading SIB19  the UE 100 may continue trying on the same cell on next 2G_SIB19_timer occasion for max 2G_SIB19_MAX_ATTEMPT  which would be maintained separately for different neighbor cells.
[0036] Further  on successful SIB19 decoding by the UE 100  the method resets 2G_SIB19_read_block_timer to 2G_SIB19_read_block_timer_MIN. The multimode controller that is present within the UE 100 is informed about the list of EUTRA cells and frequencies. Further  the UE 100 uses (308) SIB19 information along with information on GSM serving cell signal condition to initiate measurements on LTE cell 103.
[0037] In an embodiment  the UE considers UMTS (3G) thresholds as criteria for reselection to LTE cell 103. In another embodiment UE can maintain a set of its own thresholds as reselection criteria. The measurements of UMTS cell 102 may be done during the period when 2G_SIB19_timer is running.
[0038] Once the LTE measurements are completed  the UE 100 determines (309) whether LTE cell 103 is reselectable based on the reselection criteria. If the UE 100 determines LTE cell 103 is reselectable  then the UE triggers (310) reselection to the LTE cell 103. In case  no reselectable cell is determined by the UE 100  UE continues (311) to obtain the measurements of LTE cells 103. The various actions in 300 may be performed in the order presented  in a different order or simultaneously. Further  in some embodiments  some actions listed in FIG. 3 may be omitted.
[0039] In an embodiment  the LTE neighbor cells (4G cells) information is stored in a database to avoid checking for SIB19 by the UE 100 repeatedly.
[0040] In an embodiment  if all LTE neighbor cells are identified through SIB19 of neighboring UMTS cells  the UE 100 does not read the system information of neighboring UMTS cells as long as UE camps on same GSM cell. Further  on occurrence of change of cell  the UE repeats the same method.
[0041] In an embodiment  the UE 100 starts the disclosed method of finding the neighboring LTE cell 103 from a GSM cell 101  if a GSM serving cell’s signal strength falls below a threshold which shall be higher than the threshold used to trigger UMTS cell reselection. Further  the UE follows a time period using a timer module 204  where UE periodically tries the above method for a limited number of unsuccessful attempts.
[0042] Further  the UE starts the disclosed method of finding the neighboring LTE cell 103  when the UE reselects to another GSM cell 101 and the new GSM cell’s signal strength is below a certain threshold.
[0043] The method of reselection to LTE cell 103 from GSM cell 101 by the UE 100 can be temporarily stopped due to certain conditions. In an embodiment  the conditions can be when maximum number of unsuccessful attempts to find LTE neighbor cells from SIB19 is reached or incase if no SIB19 information is present in the UMTS cell 102. Further  the disclosed method can be terminated  if the scheduling of SIB19 or scheduling information for SIB19 collides with paging occasion in GSM cell 101 every time.
[0044] Consider a scenario  where SI2Quarter does not contain neighbor cell information about LTE cell 103. However  UMTS neighbor cells are present in SI2Quarter. Further  consider a situation where SIB19 information is not there in UMTS neighbor cell 102.
[0045] For the above mentioned scenario  it is assumed that the UE 100 is camped on a GSM cell 101. In its neighbor cell information  the UE 100 receives X  which is a UMTS cell 102 and does not broadcast SIB19. In such case the UE 100 follows the steps as described herein.
[0046] The UE 100 in its discontinuous reception (DRX) sleep period tries to acquire X""s MIB information and tries to read scheduling information of SIB19. In case  the SIB19 scheduling information is not present in the MIB  then the UE 100 tries to read scheduling information through SB1 and SB2. Once  it is concluded that SIB19 information does not exist for cell X  UE 100 does not read the system information of X as long as it is camped on GSM cell 101 and has not reselected to any other cell. Further  the UE 100 tries to read cell X""s information only when it has reselected to GSM cell101 through other cell.
[0047] Similarly  for above mentioned scenario  consider a case where SIB19 information is present within the UMTS neighbor cell. For this case  it is assumed that the UE 100 is camped on a GSM cell 101. In its neighbor cell information  the UE 100 receives X  which is a UMTS cell 102 and broadcasts SIB19. In such case the UE 100 follows the steps as described herein.
[0048] The UE 100 in its discontinuous reception (DRX) sleep period tries to acquire X""s MIB information and tries to read scheduling information of SIB19. In case the SIB19 scheduling info is not present in the MIB  the UE 100 tries to read scheduling information through SB1 and SB2. Once  it is concluded that SIB19 information exists for cell X  UE 100 acquires LTE neighbor cell information through SIB19 and uses this information for reselection. Further  the UE 100 maintains the unique record of absolute radio-frequency channel number (ARFCN)  Base Station Identity Code (BSIC) code and LTE neighbor list  in order to use this information for next time when UE 100 camps on GSM cell 101. Further  the UE 100 can use thresholds for reselection as applicable from SIB19.
[0049] FIG. 4 illustrates a computing environment for implementing the application  according to the embodiments as disclosed herein. As depicted the computing environment comprises at least one processing unit that is equipped with a control unit and an Arithmetic Logic Unit (ALU)  a memory  a storage unit  plurality of networking devices  and a plurality Input output (I/O) devices. The processing unit is responsible for processing the instructions of the algorithm. The processing unit receives commands from the control unit in order to perform its processing. Further  any logical and arithmetic operations involved in the execution of the instructions are computed with the help of the ALU.
[0050] The overall computing environment can be composed of master homogeneous and/or heterogeneous cores  master CPUs of different kinds  special media and other accelerators. The processing unit is responsible for processing the instructions of the algorithm. The processing unit receives commands from the control unit in order to perform its processing. Further  any logical and arithmetic operations involved in the execution of the instructions are computed with the help of the ALU. Further  the plurality of process units may be located on a single chip or over master chips.
[0051] The algorithm comprising of instructions and codes required for the implementation are stored in either the memory unit or the storage or both. At the time of execution  the instructions may be fetched from the corresponding memory and/or storage  and executed by the processing unit.
[0052] In case of any hardware implementations various networking devices or external I/O devices may be connected to the computing environment to support the implementation through the networking unit and the I/O device unit
[0053] The embodiments disclosed herein can be implemented through at least one software program running on at least one hardware device and performing network management functions to control the elements. The elements shown in Figs. 1  2 and 4 include blocks which can be at least one of a hardware device  or a combination of hardware device and software module.
[0054] The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can  by applying current knowledge  readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept  and  therefore  such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore  while the embodiments herein have been described in terms of preferred embodiments  those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.

STATEMENT OF CLAIMS
We claim:
1. A method for cell reselection to Long Term Evolution (LTE) from Global System for Mobile (GSM) by a User Equipment (UE)  wherein said method comprises:
detecting Universal Mobile Telecommunications System (UMTS) neighboring cells from system information (SI)  when said UE is camped on a said GSM cell;
searching said UMTS neighboring cells for scheduling of system information block 19 (SIB19);
reading said SIB19 information for determining said LTE neighboring cells  if said SIB19 is scheduled in said UMTS neighboring cell;
initiating measurements on said LTE cell using said SIB19 information and GSM cell information; and
triggering said cell reselection to said LTE cell based on said measurements.
2. The method as in claim 1  wherein said method searches said UMTS neighboring cells for said scheduling of SIB19 using at least one of: a master information block (MIB)  system block 1 (SB1)  system block 2 (SB2).
3. The method as in claim 2  wherein said method runs a timer while reading at least one of: said MIB  said SIB1 and said SB2 for determining scheduling of said SIB19 in said UMTS cell.
4. The method as in claim 3  wherein said timer restarts after a time interval for reading said SIB19 information  if said method fails to read said SIB19 within a scheduled time.
5. The method as in claim 4  wherein said method does not read said system information of said UMTS cell  if said SIB19 is not present for said UMTS cell.
6. The method as in claim 1  wherein said method uses said LTE neighboring cell information to reselect from said GSM to said LTE cell.
7. The method as in claim 1  wherein said method continues to measure said LTE neighboring cells  if said reselectable cell is not found in said LTE based on said measurements.
8. The method as in claim 1  wherein said method stops reading said SIB19 information of said UMTS cell when at least one of: said SIB19 is not scheduled in said UMTS cell  a maximum number of unsuccessful attempts to determine said LTE neighboring cells from said SIB19 is reached and scheduling of SIB19 or scheduling info for SIB19 collides with paging occasion in GSM every time.
9. The method as in claim 1  wherein said method triggers said cell reselection  if a reselectable cell is found in said LTE based on said measurements of said LTE neighboring cells.
10. The method as in claim 1  wherein said measurements comprise cell reselection thresholds given in at least one of: said SIB19  UE defined thresholds for said reselection to said LTE neighboring cell.
11. A system for cell reselection to Long Term Evolution (LTE) from Global System for Mobile (GSM) by a User Equipment (UE)  wherein said system comprises a GSM cell  UMTS cell and LTE cell  further  said system is configured for performing steps as claimed in at least one of claims 1 to 10.
12. A user equipment (UE) to reselect LTE cell from GSM cell  wherein said UE comprises:
an integrated circuit further comprising at least one processor;
at least one memory having a computer program code within said circuit;
said at least one memory and said computer program code configured with said at least one processor cause said UE to:
detect Universal Mobile Telecommunications System (UMTS) neighboring cells from system information (SI)  when said UE is camped on a said GSM cell;
search said UMTS neighboring cells for scheduling of system information block 19 (SIB19);
read said SIB19 information for determining said LTE neighboring cells  if said SIB19 is scheduled in said UMTS neighboring cell;
initiate measurements by a controller module on said LTE cell using said SIB19 information and GSM cell information; and
trigger said cell reselection to said LTE cell based on said measurements.
13. The UE as in claim 12  wherein said UE is configured to search said UMTS neighboring cells for said scheduling of SIB19 using at least one of: a master information block (MIB)  system block 1 (SB1)  system block 2 (SB2).
14. The UE as in claim 13  wherein said UE is configured to run a timer while reading at least one of: said MIB  said SIB1 and said SB2 for determining scheduling of said SIB19 in said UMTS cell.
15. The UE as in claim 14  wherein said timer restarts after a time interval for reading said SIB19 information  if said UE fails to read said SIB19 within a scheduled time.
16. The UE as in claim 12  wherein said UE is configured to not read said system information of said UMTS cell  if said SIB19 does not present for said UMTS cell.
17. The UE as in claim 12  wherein said UE is configured to use said LTE neighboring cell information to reselect from said GSM to said LTE cell.
18. The UE as in claim 12  wherein said UE is configured to measure said LTE neighboring cells  if said reselectable cell is not found in said LTE based on said measurements.
19. The UE as in claim 12  wherein said UE is configured to stop reading said SIB19 information of said UMTS cell when at least one of: said SIB19 is not scheduled in said UMTS cell  a maximum number of unsuccessful attempts to determine said LTE neighboring cells from said SIB19 is reached and scheduling of SIB19 or scheduling info for SIB19 collides with paging occasion in GSM every time.
20. The UE as in claim 12  wherein said UE is configured to trigger said cell reselection  if a reselectable cell is found in said LTE based on said measurements of said LTE neighboring cells.

Dated: 9th day of October  2012 Signature:
Dr Kalyan Chakravarthy
Patent agent

ABSTRACT
A method and system for user equipment (UE) to reselect from GSM cell to LTE cell  without LTE neighbor cell information available in System Information is disclosed. The method provides a time period during which the master block information (MIB) and scheduling blocks of the neighboring blocks of UMTS cells are read by the UE in order to determine the scheduling of system information block (SIB19). Once the SIB19 scheduling information is determined by the UE  the UE reads SIB19 and obtains information about LTE neighboring cells. Further  the UE initiates LTE RRC measurements for the frequencies and cells. Once the LTE measurements meet the required criteria  the UE triggers reselection to the LTE cell.
FIG. 3