JP4477676B2 - Method for executing handoff of mobile terminal in mobile communication system - Google Patents

Abstract

For a mobile communications system, a method of allowing a mobile station in idle state to perform handoffs in a more efficient manner is provided. This is achieved by receiving, from a source base station via a first channel, channel information of a second channel that is a different type of channel than the first channel, the second channel being used for transmitting overhead messages by at least one neighboring base station; determining a target base station among the one or more neighboring base stations; and receiving the second channel from the target base station by using the channel information.

Description

  The present invention relates to a mobile communication system, and more particularly, to a method for performing and supporting handoff more effectively for an idle mobile station of a mobile communication system.

  FIG. 1 is a diagram showing an example of a comprehensive call processing process starting from the stage of turning on a mobile station in a mobile communication system. When power is supplied to the mobile station, necessary system information is read from the memory, set in the RAM (or other storage means), and a system using a pilot channel and a synchronization channel is used. To enter the mobile station initialization state in order to receive necessary system information. Messages sent on the synchronization channel (e.g., synchronization channel message) are system information, a paging channel or P that allows an idle mobile station to decode a paging channel or P-BCCH (Primary Broadcast Control Channel). -Includes frequency information on BCCH and data rate or coding rate information. If the P-BCCH is used, it further includes transmission diversity related information.

  The mobile station idle state refers to the paging channel or P by using the information transmitted by the synchronization channel message after the mobile station receives all system information in the initialized state and completes normal operation. -It means that an overhead message has been received from the base station on the BCCH. Examples of the overhead message include SPM (System Parameters Message) including system-related information, ESPM (Extended System Parameters Message), GNLM (General Neighbor List Message) including information on neighboring cells or sectors, And UNLM (Universal Neighbor List Message).

  The system access state means a state where the mobile station can access the system, and the traffic state means a state where the mobile station is communicating, for example, a call is being made. The mobile station in the system access state returns to the idle state or the traffic state when the specific operation is completed. On the other hand, if the message transmitted on the paging channel or P-BCCH is not received in the idle state, the initialization procedure is started again. In a mobile station in a traffic state, if the call is terminated in the middle of a call, the initialization procedure is started again to reestablish synchronization.

  The mobile station not only measures the strength of the pilot signal of the serving base station, but also acquires information such as PILOT_PN related to the neighboring cell by a neighboring message such as GNLM, ENLM, UNLM, and the strength of the pilot signal of the neighboring cell. Keep monitoring. As a result of such monitoring, when the strength of the pilot signal of the adjacent cell increases by a predetermined threshold or more compared to the strength of the pilot signal of the serving base station, the mobile station Performs an idle handoff, which means receiving a paging channel or P-BCCH from.

  Hereinafter, a base station that moves when a mobile station performs idle handoff is referred to as a target base station, and a current base station is referred to as a source base station.

  In a situation where the mobile station that has received the paging channel has to move to the target base station and receive the P-BCCH, the mobile station does not receive any information necessary to decode the P-BCCH from the source base station. The prior art had a problem because it did not receive. More specifically, as shown in FIGS. 2 and 3, during the idle state handoff, the idle state is not immediately changed to the idle state. However, after the mobile station moves to the target base station and enters a system determination sub-state, it receives a pilot channel and a synchronization channel, and receives information on the P-BCCH therefrom. After that, it enters an idle state. This causes a delay problem.

  In addition, when a paging channel is received from the source base station and a paging channel is received when moving to the target base station, a data rate is changed when moving to the target base station by handover (For example, a change from 4800 bps to 9600 bps), a conventional mobile station must enter an idle state after entering a system decision sub-state, which can cause delay problems. A similar problem occurs when a conventional mobile station that has received P-BCCH from the source base station needs to receive a paging channel after performing a handover to the target base station.

  Similarly, in a situation where P-BCCH is received from the source base station and P-BCCH is received from the target base station, the data rate, coding rate, or Walsh code is changed in the target base station. The conventional mobile station has to enter the idle state after entering the system decision sub-state, thus causing a delay problem.

  If such a delay occurs during an idle state handoff, if the conventional mobile station receives a broadcast service from the source base station in an idle state, such a delay greatly affects the broadcast service quality (QoS). give. In other words, since a conventional mobile station in an idle state receives a broadcast service by F-SCH (Forward Supplement Channel), when performing an idle handoff, when entering an idle state through a system judgment sub-state, a delay time Cannot receive the broadcast service.

  One aspect of the present invention is based on the inventor's recognition of the disadvantages of the prior art described above. Based on such recognition, an improvement in the idle state handoff procedure can be realized by the present invention.

  The present invention has been made to solve the above-described problems of the prior art, and minimizes unnecessary delay that may occur when an idle mobile station of a mobile communication system performs a handoff, thereby It aims at minimizing quality degradation of a specific service received from a base station.

  The present invention provides a method for supporting mobile station idle state handoff performed by a base station of a mobile communication system. The present invention provides a method for performing an idle mobile station handoff in a mobile communication system that can continue to receive broadcast or multicast services before and after performing the idle handoff.

  More specifically, the present invention determines whether the configuration information of the target base station is present in the pre-stored configuration information received from the neighboring base station, and if it is determined that the configuration information exists, An idle handoff is performed using the stored configuration information of the target base station, and if it is determined that the configuration information does not exist, the system determination sub-state is returned.

  Additional advantages, objects, and features of the present invention will be set forth, in part, in the detailed description of the invention described below, and will be described in part by those having ordinary skill in the art. Or will be understood by practice of the present invention. The objects and advantages of the invention will be realized and attained as particularly pointed out in the appended claims.

  The present invention is implemented and described in a 3GPP2 type mobile communication system. However, because the concepts and teachings of the present invention can be applied to a variety of communication schemes that operate in a similar manner based on common technology, the features of the present invention can be found in other types of communication standards (eg, 3GPP, 4G, IEEE, It can also be realized by applying to a communication system compliant with OMA.

  The present invention will also be described in the context of BCMCS (Broadcast / Multicast Services). However, the features of the present invention can be applied to various types of one-to-many services that provide multimedia data to users, such as MBMS (Multimedia Broadcast / Multicast Service), media broadcast, and content transmission.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited thereto.

  In the mobile communication system, the present invention reduces the quality of service received from a target base station by minimizing unnecessary delay when an idle mobile station performs a handoff between the source base station and the target base station. Provide a way to minimize

  4 and 5 illustrate features of embodiments of the present invention. In a situation where information of neighboring base stations is transmitted from the source base station to the mobile station through a paging channel by an overhead message (GNLM, ENLM, UNLM, etc.), the neighboring base station may support P-BCCH ( Alternatively, in the case of a base station that transmits the overhead message on another equivalent or similar control channel), the channel information of the P-BCCH of the target base station is received earlier from the source base station by the overhead message. After the handoff is completed, the channel information is used to receive the target base station P-BCCH so that an overhead message can be received with a minimum delay.

  FIG. 6 is a flowchart showing the procedure of one embodiment of the present invention. The idle mobile station receives an overhead message including channel information of the P-BCCH of at least one neighboring base station from the source base station through the paging channel (S41).

  The source base station may receive the channel information from a base station controller (BSC) or other network entity having a similar function. Examples of the overhead message include GNLM, ENLM, UNLM, and BSPM (BCMC Service Parameters Message). It will be appreciated that other types of messages having the same or similar functions can also be used here.

  The BSPM message is a message broadcast to a mobile station that intends to receive a broadcast service, and includes control information for receiving broadcast service data. It should be noted that if the BSPM message is not received, the mobile station can enter a system decision sub-state before entering the idle state to obtain the necessary broadcast / multicast service parameters.

  The channel information indicates information for decoding the P-BCCH, and includes information regarding a P-BCCH usage frequency (usage frequency), a coding rate, a data rate, and transmission diversity of the P-BCCH. Table 1 shows an example of a data format of P-BCCH channel information included in the overhead message. The channel information includes all or part of the items shown in Table 1.

ここで、上記表１に列挙したフィールドの特定名称又はラベルは例示にすぎないことを本発明の属する技術の分野における通常の知識を有する者であれば理解するであろう。さらに、付加的な及び／又は他の同等もしくは類似の名称又はラベルを本発明で使用できる特定フィールドを示すのに使用できる。

Here, those skilled in the art to which the present invention pertains will understand that the specific names or labels of the fields listed in Table 1 above are merely examples. Additionally, additional and / or other equivalent or similar names or labels can be used to indicate specific fields that can be used with the present invention.

  In the example of Table 1, SR1 (Spreading Rate 1) includes information regarding whether or not transmission diversity is used, frequency used in P-BCCH depending on whether or not transmission diversity is used, coding rate, Data rate is included. SR3 (Spreading Rate 3) includes information about a frequency used in P-BCCH, a coding rate, and a data rate.

  Hereinafter, each field of Table 1 will be described.

  BCMC_SR1_BCCH_NON_TD_INCL is an indicator indicating whether or not BCCH information is included when SR1 is not in TD (Transmit Diversity) mode.

  BCMC_SR1_NON_TD_FREQ_INCL is an indicator indicating whether or not frequency information of SR1 non-transmission diversity is included.

  BCMC_SR1_CDMA_FREQ_NON_TD is a field related to SR1 non-transmission diversity frequency allocation.

  BCMC_SR1_BRAT_NON_TD is a BCCH data rate field in the SR1 non-transmission diversity mode.

  BCMC_SR1_CRAT_NON_TD is a BCCH code rate field in the SR1 non-transmission diversity mode.

  BCMC_SR1_BCCH_CODE_CHAN_NON_TD is a Walsh code field for SR1 BCCH in the non-transmit diversity mode.

  BCMC_SR1_TD_INCL is an indicator field including SR1 transmission diversity frequency information.

  BCMC_SR1_CDMA_FREQ_TD is an SR1 frequency allocation field related to transmission diversity operation.

  BCMC_SR1_BRAT_TD is a BCCH data rate field in the SR1 transmission diversity mode.

  BCMC_SR1_CRAT_TD is a coding rate field in the SR1 transmission diversity mode.

  BCMC_SR1_BCCH_CODE_CHAN_TD is an SR1 BCCH Walsh code field in the transmit diversity mode.

  BCMC_SR1_TD_MODE is an SR1 transmission diversity mode field.

  BCMC_SR1_TD_POWER_MODE is an SR1 transmission diversity transmission power level field.

  BCMC_SR3_INCL is an indicator field indicating whether SR3 information is included.

  BCMC_SR3_CENTER_FREQ_INCL is a field indicating the center SR3 frequency allocation.

  BCMC_SR3_CENTER_FREQ is a center SR3 frequency allocation field.

  BCMC_SR3_BRAT is an SR3 BCCH data rate field.

  BCMC_SR3_BCCH_CODE_CHAN is an SR3 BCCH Walsh code field.

  BCMC_SR3_PRIMARY_PILOT is a first SR3 pilot field.

  BCMC_SR3_PILOT_POWER1 is a first SR3 pilot power level field for the lower of the two remaining SR3 frequencies.

  BCMC_SR3_PILOT_POWER2 is a first SR3 pilot power level field for the higher of the two remaining SR3 frequencies.

  Table 2 shows an example of a message when the source base station notifies the mobile station of information related to the P-BCCH of the adjacent base station by BSPM. In Table 2, BCMC_NUM_NGHBR indicates the number of neighboring base stations to which P-BCCH related information is notified by BSPM, and BCMC_NGHBR_PN includes PN offset information of each neighboring base station. Information on the BCMC_NGHBR_PN and the P-BCCH is included by the number of neighboring base stations {BCMC_NUM_NGHBR}.

ここで、上記表２に列挙したフィールドの特定名称又はラベルは例示にすぎないことを本発明の属する技術の分野における通常の知識を有する者であれば理解するであろう。さらに、付加的な及び／又は他の同等もしくは類似の名称又はラベルを本発明で使用できる特定フィールドを示すのに使用できる。

Here, those skilled in the art to which the present invention pertains will understand that the specific names or labels of the fields listed in Table 2 above are merely examples. Additionally, additional and / or other equivalent or similar names or labels can be used to indicate specific fields that can be used with the present invention.

  Although all data related to the channel information can be transmitted by the method in which the source base station transmits such channel information to the mobile station, other methods can be considered. That is, matching between the channel information and the bit information can be executed by a combination (combination or set) of channel information. Here, the number of bit information is predetermined among the source base station, the mobile station, and the adjacent base station. For example, in order to indicate the “configuration” of adjacent base stations, reserved values (reserved values) of NGHBR_CONFIG (which is a 3-bit field transmitted by GNLM that is greater by the number of adjacent base stations) are included in the channel information. It is used for matching each combination (combination or set) of the P-BCCH usage frequency, coding rate, and data rate with 3-bit bit information. Therefore, bit information matched with the current channel information of the P-BCCH of the adjacent base station can be transmitted, and the load amount for transmitting the channel information can be reduced. In addition, when the adjacent base station transmits the P-BCCH, the coding rate, and the data rate at a specific use frequency, which are determined in advance between the source base station and the mobile station, the channel information includes one bit “indication”. "Can be transmitted by a simple procedure such as setting" 1 "to" 1 ".

  The mobile station that has received the P-BCCH channel information of the neighboring base station from the source base station can store the received information in a memory and use it in a later handoff.

  If BCMC_SR1_BCCH_NON_TD_INCL said received is set to "1" setting, BCMC_SR1_NON_TD_FREQ_INCL the mobile station received from the base station, BCMC_SR1_BRAT_NON_TD, BCMC_SR1_CRAT_NON_TD, and the value of BCMC_SR1_BCCH_CODE_CHAN_NON_TD stored in the memory, BCMC_SR1_NON_TD_FREQ_INCL is that the received "1" If so, BCMC_SR1_CDMA_FREQ_NON_TD received from the base station is stored.

  When BCMC_SR1_TD_INCL is set to “1”, BCMC_SR1_CDMA_FREQ_TD, BCMC_SR1_BRAT_TD, BCMC_SR1_CRAT_TD, BCMC_SR1_BCCH_CODE1_TCMC_TD1, BCMC_SR1

  Also, if BCMC_SR3_BRAT_TD received from the base station is set to "1", BCMC_SR3_CENTER_FREQ_INCL, BCMC_SR3_BRAT, BCMC_SR3_BCCH_CODE_CHAN, BCMC_SR3_PRIMARY_PILOT, BCMC_SR3_PILOT_POWER1, and information BCMC_SR3_PILOT_POWER2 is saved, further, if BCMC_SR3_CENTER_FREQ_INCL is set to "1", BCMC_SR3_CENTER_FREQ received from the base station is stored.

  The mobile station continues to monitor the strength of the pilot signal of the adjacent base station, and when the strength of the pilot signal of the adjacent base station increases above a predetermined threshold with respect to the strength of the pilot signal of the source base station, The station is determined as the target base station, and handoff is executed (S42).

  When performing handoff, the mobile station uses the channel information received and held from the source base station to receive the P-BCCH transmitted by the target base station with a minimum delay (S43). . Therefore, since an idle mobile station receives a different service (such as a broadcast service) from the source base station via F-SCH (Forward Supplemental Channel), even if an idle handoff to the target base station is performed, the mobile station is in the idle state. There is no delay caused by going through the system decision state before entering, and the idle state can be entered immediately. Therefore, the service provided from the source base station can be continuously received from the target base station without disconnection.

Hereinafter, an operation procedure in the target base station when the mobile station performs the idle state handoff will be described in detail. When the mobile station performs sequence number initialization for an overhead message received on the P-BCCH from the target base station, first, a sequence is performed for the overhead message related to the access channel or the enhanced access channel. The number is initialized and the PILOT_PN _S of the memory is received from the source base station to set the value of BCMC_NGBHR_PN held in the storage device. As a result of receiving an overhead message from the P-BCCH of the target base station, if it is determined that the overhead information held in the storage device is the latest, the received information hashes the new F-CCCH. Used to do so, paging etc. are received from the F-CCCH. If it is determined that the overhead information held in the storage device is not the latest as a result of receiving the overhead message, the mobile station initializes a sequence number for the related message. Whether the overhead message is the latest one can be determined by comparing the received sequence number of the message with the stored sequence number. After passing through the procedure, the mobile station receives NGBHR_FSCH_FREQ (that is, corresponding frequency information of FSCH that is a channel for receiving broadcast service) received by the BSPM of the source base station and held in the memory of the target base station. Compare to see if it matches CDMACH _S. If not, the CDMACH _S is set to NGHBR_FSCH_FREQ, and the broadcast is monitored from the FSCH when tuning to a new CDMA channel.

  The embodiment has been described above in which the mobile station moves to the target base station to receive the P-BCCH after receiving the paging channel from the source base station. In another embodiment, during a procedure in which a mobile station that has received a P-BCCH from a source base station moves to a target base station and receives a P-BCCH when performing an idle state handover, a data rate, a code rate, And / or if the Walsh code is changed, the features of the present invention can be applied.

  In more detail, the conventional mobile station performs a handover and causes a delay when moving to the target base station. This is because the idle state must first be entered after entering the system judgment state. However, according to the present invention, the mobile station receives in advance the P-BCCH channel information (frequency, data rate, coding rate, Walsh code, etc.) of the target base station from the source base station through a P-BCCH overhead message. Accordingly, after the handoff is completed, the channel information is used to receive the P-BCCH of the target base station so that an overhead message can be received with minimum delay or without delay.

  In another embodiment of the present invention, when the paging channel is received from the source base station and the paging channel is received again after moving to the target base station, the data rate is reduced when moving to the target base station by handover. Even when it is changed (for example, change from 4800 bps to 9600 bps), the feature of the present invention can be applied. In this case, the mobile station previously receives paging channel information (eg, GNLM, ENLM, UNLM, BSPM, etc.) of the adjacent base station from the source base station by an overhead message. Accordingly, after the handoff is completed, the channel information is used to receive the P-BCCH of the target base station so that an overhead message can be received without delay.

  In still another embodiment of the present invention, when the P-BCCH is received from the source base station but the paging channel is received after moving to the target base station, when moving to the target base station by handover, Even if there is a difference in the default data rate (for example, 9600 bps) for the target base station to transmit the paging channel, the features of the present invention can be applied. In this case, the source base station transmits the paging channel information (particularly the current data rate) of the target base station to the mobile station by an overhead message in order to prevent or minimize unnecessary delay in the handover procedure.

  In order to realize the various features described above, the present invention can adopt various types of hardware and / or software components (modules). For example, different hardware modules may include various circuits and components necessary to perform the method steps. Also, different software modules (executed by the processor and / or other hardware) may contain various codes and protocols necessary to perform the method steps of the present invention.

  The present invention includes a step of receiving and storing configuration information of an adjacent base station, confirming the strength of the pilot channel of the adjacent base station, and the strength of the pilot signal of the target base station that is greater than the strength of the pilot signal of the source base station Determining whether the configuration information of the target base station exists in the stored configuration information of the neighboring base station, and determining a method for performing idle handoff based on the confirmation Providing a method for supporting handoff when a mobile station is in an idle mode.

  The step of determining includes returning to a system determination sub-state when the configuration information does not exist. The determining includes performing an idle handoff using the stored configuration information of the target base station when the configuration information is present.

  The configuration information is received by an overhead message. The overhead message includes a BSPM and a neighbor list message. The neighbor list message includes at least one of GNLM, ENLM, and UNLM.

  The overhead message includes a field indicating information of a physical channel used by an idle mobile station through which the overhead message is transmitted. The physical channel information indicates whether or not transmission diversity is supported. When supporting transmit diversity, appropriate values for parameters including frequency allocation, data rate, code rate, Walsh code, transmit diversity mode, and power level are used. If transmit diversity is not supported, appropriate values for parameters including frequency allocation, data rate, code rate, and Walsh code are used.

  Monitor the PCH before the mobile station performs idle handoff, select an adjacent base station for idle handoff supporting P-BCCH, and receive parameters of the P-BCCH of the adjacent base station from the BSPM If so, the mobile station then performs a normal handoff procedure.

  The source base station transmits an overhead message on a first control channel for overhead messages, and the target base station transmits an overhead message on a second control channel for overhead messages. The first and second control channels are broadcast control channels. The first control channel is PCH, and the second control channel is P-BCCH.

  The information includes at least one of a pilot PN sequence offset and appropriate values for frequency allocation, data rate, code rate, and Walsh code. The information is provided in a quantity that matches the total number of neighboring base stations.

  The present invention also provides a step of detecting a pilot signal strength of a target base station larger than a pilot signal strength of a source base station when confirming pilot channel strengths of a plurality of adjacent base stations, Determining whether the configuration information exists in the pre-stored configuration information received from the neighboring base station; and, if the configuration information exists, use the stored configuration information of the target base station. Performing a handoff, or returning to a system decision sub-state if the configuration information is not present, providing a method for supporting handoff when the mobile station is in idle mode.

  The configuration information is received by an overhead message including a one-to-many service parameter and a list of neighboring base stations. The overhead message includes a parameter of a physical channel used for transmission of the overhead message, and the parameter indicates whether to support transmission diversity. When supporting transmission diversity, the overhead message includes values for frequency assignment, data rate, code rate, Walsh code, transmission diversity mode, and power level. If transmit diversity is not supported, the overhead message includes frequency assignment, data rate, code rate, and Walsh code values.

  Each parameter for each neighboring base station is provided to match the total number of parameters to the total number of neighboring base stations.

  The present invention is not limited to the above-described embodiments and the accompanying drawings, and various alternatives, modifications, and variations are possible within the scope of the technology of the present invention as long as they have ordinary knowledge in the technical field to which the present invention belongs. You will understand that is possible.

  According to a preferred result and effect of the present invention, there is provided a source base station in which an idle mobile station transmits an overhead message on each of different types of channels according to a method for performing a handoff to an idle mobile station in a mobile communication system. By preventing unnecessary delay when performing handoff between target base stations, the quality of service received from the source base station can be maintained without degradation of service quality when performing handoff. In particular, this results in idle mobile stations receiving broadcast or multicast services without interruption before and after performing a handoff.

  Various exemplary embodiments of the invention are described herein. The claims are intended to cover various modifications and equivalent arrangements of the exemplary embodiments described herein. Accordingly, the appended claims should be construed broadly to include modifications, equivalent structures, and features consistent with the spirit and scope of the disclosed invention.

It is a figure which shows an example of the comprehensive call processing process which starts from the step which turns on the power supply of a mobile station in a mobile communication system. It is a figure which shows the conventional idle handoff execution procedure. It is a figure which shows the conventional idle handoff execution procedure. It is a figure which shows the idle handoff execution procedure by this invention. It is a figure which shows the idle handoff execution procedure by this invention. It is a flowchart which shows the procedure of one Embodiment of this invention.

Claims (20)

A method of supporting handoff when a mobile station is in idle mode,
The method
Receiving and storing configuration information of neighboring base stations;
Detecting the strength of the pilot signal of the target base station that is greater than the strength of the target signal of the source base station while checking the strength of the pilot channel of the adjacent base station;
Checking whether the configuration information of the target base station exists in the configuration information stored in the neighboring base station;
And a to determine how to perform the idle handoff based on said confirmation,
The mobile station (1) monitoring a paging channel (PCH) before performing an idle handoff ; and (2) selecting a neighboring base station for idle handoff , the selected neighboring base station supports P-BCCH (Primary Broadcast Control Channel ), and that, and receiving the parameters of the P-BCCH of the neighboring base stations through the (3) BSPM (Broadcast / Multicast Service parameters Message) when done, the mobile station have line normal handoff procedure,
If the configuration information is present as a result of the determination, an idle handoff is performed using the stored configuration information of the target base station without having to enter a system determination substate, and the configuration information The method enters the system decision sub-state if no exists . The method of claim 1 , wherein the configuration information is received via an overhead message. The overhead message includes a BSPM (Broadcast / Multicast Service Parameters Message) and a neighbor list message ,
The neighbor list message, GNLM (General Neighbor List Message) , ENLM (Extended Neighbor List Message), comprises at least one of UNLM (Universal Neighbor List Message), Method according to claim 2. The overhead message includes a field indicating information of the physical channel, the overhead message is transmitted in the physical channel, the physical channel is used by the mobile station in idle state,
The physical channel information indicates whether transmit diversity is supported;
If the transmit diversity is supported, appropriate values for parameters including frequency allocation, data rate, code rate, Walsh code, transmit diversity mode and power level are used,
4. The method of claim 3 , wherein if the transmit diversity is not supported, appropriate values for parameters including frequency allocation, data rate, code rate and Walsh code are used . The information includes at least one of a pilot PN sequence offset and an appropriate value for frequency allocation, data rate, code rate and Walsh code ;
The method of claim 4 , wherein the information is provided in a quantity that matches a total number of neighboring base stations . The source base station transmits an overhead message via a first control channel for overhead messages, and the target base station transmits an overhead message via a second control channel for overhead messages ;
The first control channel and the second control channel are broadcast control channels;
The method of claim 2 , wherein the first control channel is PCH and the second control channel is P-BCCH . A method of supporting handoff when a mobile station is in idle mode,
The method
Detecting the strength of the pilot signal of the target base station that is greater than the strength of the pilot signal of the source base station when checking the strength of the pilot channels of a plurality of adjacent base stations;
Determining whether the configuration information of the target base station is present in pre- stored configuration information about the neighboring base station received from the source base station ;
When said configuration information exists, includes without having to enter the system determination sub-state, and performing a handoff using the stored configuration information of the target base station,
The configuration information is received via an overhead message including a one-to-many service parameter and a list of neighboring base stations;
The overhead message includes the parameters of the physical channel used in transmitting the overhead message, the parameter indicates whether Tei Luke not transmitted diversity support method. If transmit diversity is Ru Tei supported, the overhead message, frequency allocation, data rate, code rate, Walsh code, which contains the value of the transmit diversity mode and power level The method of claim 7. When transmission diversity is not Tei supported, the overhead message, frequency allocation, data rate, contains the value of code rate and Walsh code The method of claim 7. 8. The method of claim 7 , wherein the total number of parameters is matched to the total number of neighboring base stations by providing a parameter for each neighboring base station, respectively. A method for a mobile station to perform an idle handoff from one base station to another, comprising:
The method
Detecting the strength of a pilot signal of a target base station sufficiently higher than the strength of a pilot signal of a source base station when confirming the strength of pilot signals of a plurality of adjacent base stations, Supporting P-BCCH (Primary Broadcast Control Channel);
Receiving a P-BCCH or a paging channel (PCH) from the target base station when moving from the source base station coverage area to the target base station coverage area;
Including
Receiving the P-BCCH or the PCH is performed by using channel information regarding one or more neighboring base stations, and the channel information is obtained from BSPM (Broadcast / Multicast Service Parameters) transmitted from the source base station. Received via at least one overhead message including Message)
The channel information includes information on the P-BCCH or the PCH,
The channel information includes one or more fields indicating whether transmit diversity is used,
When the transmission diversity is used, the channel information includes fields indicating frequency allocation, data rate, code rate, Walsh code, transmission diversity mode, and power level,
When the transmission diversity is not used, fields indicating frequency allocation, data rate, code rate and Walsh code are included in the channel information,
The channel information refers to information for decoding the P-BCCH, and the information includes a P-BCCH usage frequency, a code rate, a data rate, and transmission diversity of the P-BCCH,
One or more fields for SR (Spreading Rate) indicate whether or not the transmission diversity is used, and indicate a frequency used for the P-BCCH according to whether or not the transmission diversity is used. The method of indicating the code rate and indicating the data rate. The channel information is received from the source base station without having to enter a system decision sub-state while the mobile station is in an idle state, and is idle if the channel information is not received from the source base station. 12. The method of claim 11, wherein the mobile station in a state enters a system decision sub-state before returning to an idle state to obtain the channel information. The channel information further includes an adjacency list message, and the adjacency list message includes GNLM (General Neighbor List Message), ENLM (Extended Neighbor List Message), and UNLM (Universal Neighbor List List M). The method of claim 12. The channel information further includes a field indicating the number of neighboring base stations to which information on P-BCCH is to be notified via the BSPM, and a field indicating pilot PN sequence offset information of each neighboring base station. 14. The method according to 13. The method according to claim 14, wherein the channel information matches bit information according to an association, combination or set of channel information for reducing a load amount for transmitting the channel information. How to receive the P-BCCH or the PCH using channel information when moving from the source base station coverage area to the target base station coverage area is set in the 3-bit field (NGHBR_CONFIG) The method of claim 15, wherein the method is performed in response to what is done. The method of claim 16, wherein the channel information received from the source base station is stored for later use during a subsequent handoff procedure. The method according to claim 17, wherein after handoff, the channel information received from the source base station is used to receive an overhead message from the P-BCCH of the target base station. The method according to claim 18, wherein a forward common control channel (F-CCCH) is received for monitoring if it is determined that the overhead information held in the storage device is recent. A method for a mobile station to perform an idle handoff,
The method
Monitoring the paging channel for the source base station while the mobile station is idle;
Receiving channel information of the target base station from the source base station via BSPM (Broadcast / Multicast Service Parameters Message) while the mobile station is in an idle state, wherein the BSPM relates to a broadcast control channel Further including information and information on transmit diversity, wherein the receiving is performed by the mobile station without having to enter an initialization state, and entering the initialization state includes four sub-states in succession. The four sub-states include a system decision sub-state, a pilot channel acquisition sub-state, a synchronization channel acquisition sub-state and a timing change sub-state, ,
Storing the channel information received via the BSPM for each of a plurality of neighboring base stations supporting the broadcast control channel indicated in the BSPN;
Performing an idle state handoff to the target base station using the received P-BCCH channel information while the mobile station is in the idle state;
Including a method.

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