CN101415269B

CN101415269B - Double-mode GSM physical layer system and implementing method thereof

Info

Publication number: CN101415269B
Application number: CN2008102178709A
Authority: CN
Inventors: 陈昊
Original assignee: ZTE Corp
Current assignee: Sanechips Technology Co Ltd
Priority date: 2008-11-21
Filing date: 2008-11-21
Publication date: 2011-03-16
Anticipated expiration: 2028-11-21
Also published as: CN101415269A

Abstract

The invention discloses a bimodal GSM physical layer system and a realizing method thereof. The method comprises the following steps: a GSM physical layer realizes the deviation of frame timing between two asynchronous GSM and TD-SCDMA systems by controlling a time processing unit in the GSM and a time processing unit in the TD-SCDMA; under the mode mainly based on GSM, GSM controls the TD-SCDMA system to independently arrange the time for processing tasks; under the mode that GSM is dependent, the TD-SCDMA system notifies GSM of the idle time by functions. By adopting the mutual measurement, the time synchronization and the message interaction which are realized between bimodal time-asynchronous systems, the bimodal GSM physical layer system and the realizing method of a bimodal baseband chip provides convenience to the coexistence and independent and normal work of two time-asynchronous systems .Thus, the GSM/TD-SCDMA bimodal mechanism is realized.

Description

A kind of double-mode GSM physical layer system and its implementation

Technical field

The invention belongs to a kind of mobile communication system and its implementation, the bottom layer realization method and system of in particular a kind of handheld terminal, digital baseband chip part, how the GSM side physical layer that is mainly used in GSM/TD-SCDMA dual mode system digital baseband realizes in the mechanism of bimodulus.

Background technology:

In the prior art, GSM is present the most popular second generation mobile communication system; And TD-SCDMA is by the autonomous 3-G (Generation Three mobile communication system) that proposes of China.User's selection for convenience, the terminal of prior art need be supported GSM technology and TD-SCDMA technology simultaneously, can carry out purposive mobile roaming voluntarily or switching, bimodulus technology that Here it is in GSM network or TD-SCDMA network.

At present, it all is to add the dual system pair standby schemes that the single mode chip of TD-SCDMA is formed by the single mode chip with GSM that the bimodulus of main GSM/TD-SCDMA is used, and does not have functions such as network selecting/gravity treatment between system or switching.Because its dual mode system digital baseband is realized having difficulties, bimodulus treatment mechanism process complexity can not merge two communication systems fully, and equipment need adopt two central processing units, its cost height, handling process complexity.

Summary of the invention

The objective of the invention is to propose a kind of double-mode GSM physical layer system and its implementation, realize GSM dual mode data and the bimodulus handling process seamless fusion relevant with TD-SCDMA, technological difficulties when realizing to solve GSM/TD-SCDMA dual mode system digital baseband, and simplify the treatment mechanism of bimodulus, realize GSM and two technology of TD-SCDMA on single central processing unit and deposit.

Technical scheme of the present invention comprises:

A kind of implementation method of double-mode GSM physical layer system, it may further comprise the steps:

The physical layer of A, GSM realizes the deviation between the frame timing between GSM and two different systems of TD-SCDMA by the time processing unit of control GSM inside and the time processing unit of TD-SCDMA inside;

B, under GSM is main pattern, GSM controls to selling the TD-SCDMA system and arranges by oneself the time that task own handles; Under the pattern of GSM subordinate, the TD-SCDMA system can notify GSM the free time time slot by function, and helps GSM to determine following will carrying out of the task of subordinate pattern,

And under the pattern of GSM subordinate, the task that GSM will carry out comprises the following steps of rssi measurement process: B31, TD primary module execution function 11co_td_rssi_meas, and according to registered events ID request for data structure space, the skew of computing time and task starting time, the largest cell number of the interior energy measurement of clearance G AP computing time; B32, activation 11co_td_rssi_frame_tick, this activation realizes by GSM frame interrupt call 11co_td_frame_tick function, thus executing state machine STATE_RSSI_IDLE; STATE_RSSI_WAIT, STATE_RSSI_PREPARE, STATE_RSSI_WAIT_RESULT.

Described method, wherein, described step B also comprises:

B1, under GSM is main pattern, and during idle pulley, provide a free time of determining of calculating, and by message informing TD-SCDMA system.

Described method, wherein, described step B also comprises:

B2, under GSM is main pattern, and GSM is in and inserts or during connection mode, then arrange continuous idle frame to give the TD-SCDMA system.

Described method, wherein, described step B also is included under the pattern of GSM subordinate, the task that GSM will carry out comprises the request process of FCCH/SCH channel: the TD primary module is carried out function 11co_td_fcb_sb_read, and according to registered events ID request for data structure space, the zero-time of computing time skew and task, according to state machine state STATE_FCB_SB_IDLE and incident START_FCB_SEARCH, activation 11co_td_fcb_sb_frame_tick.

Described method, wherein, the process of described activation 11co_td_fcb_sb_frame_tick is called 11co_td_frame_tick by GSM frame terminal, carries out function 11co_td_fcb_sb_frame_tick, and to cell list executing state machine process: STATE_FCB_SB_IDLE successively; STATE_FCB_WAIT; STATE_FCB_PREPARE; STATE_FCB_RESULT, and judge whether FCB reads correct, if then continue to carry out following state machine process: STATE_SB_READ; STATE_SB-WAIT; STATE_SB_PREPARE; STATE_SB_RESULT.

A kind of double-mode GSM physical layer system, it is included in, and to carry out function mutual and carry out the GSM physical layer of interacting message with gsm wireless resource GRR and TD Radio Resource control TRRC with the TD correlation module; Wherein, the setting of described GSM physical layer comprises:

The asynchronous process module is used for interacting message and the processing with the high-rise module of GRR/TRRC, specifically comprises time processing unit and the time processing unit realization GSM of TD-SCDMA inside and the deviation frame timing TD-SCDMA two systems between between of the physical layer of GSM by control GSM inside;

Synchronous processing module, be used for by GSM frame down trigger, and interior work and the task of planning of each GSM frame of handling physical layer, and the relevant TD-SCDMA call function result of processing, specifically comprise: under GSM was main pattern, GSM controlled to selling the TD-SCDMA system and arranges by oneself the time that task own handles; Under the pattern of GSM subordinate, the TD-SCDMA system can notify GSM the free time time slot by function, and help GSM to determine following will carrying out of the task of subordinate pattern, and under the pattern of GSM subordinate, the task that GSM will carry out comprises the following steps of rssi measurement process: B31, TD primary module execution function 11co_td_rssi_meas, and according to registered events ID request for data structure space, the skew of computing time and task starting time, the largest cell number of the interior energy measurement of clearance G AP computing time; B32, activation 11co_td_rssi_frame_tick, this activation realizes by GSM frame interrupt call 11co_td_frame_tick function, thus executing state machine: STATE_RS_SI_IDLE; STATE_RS_SLWAIT, STATE_RS_SI_PREPARE, STATE_RS_SI_WAIT_RESULT;

Hardware drive module is used for the hardware module of gsm system inside is driven, comprising the driving of time processing unit;

The DSP control module is used for the DSP control to the calculation process module of GSM.

Described system, wherein, the driving of described Hardware drive module comprises hardware driving and the low power consumption control that uplink downlink is relevant.

Described system, wherein, the control of described DSP control module comprises interface, task interaction mechanism, interruption and handshake method.

Described system, wherein, the time processing unit of TD-SCDMA system can be triggered by the hardware interrupts rising edge of the time processing unit of gsm system, comes the synchronous and conversion time to the time timing point of deposited two different systems with this.

A kind of double-mode GSM physical layer system provided by the present invention and its implementation; owing to adopted mutual measurement, time synchronized, the interacting message of when bimodulus, realizing between the different service system; the coexistence of different system and can independent operate as normal two time has realized GSM/TD-SCDMA bimodulus mechanism when having made things convenient for bimodulus.

Description of drawings

Fig. 1 realizes the system architecture schematic diagram for the bimodulus of implementation method of the present invention;

Fig. 2 is the rssi measurement request schematic flow sheet of the corresponding TD-SCDMA of GSM of the present invention;

Fig. 3 is the measurement request schematic diagram of the FCCH/SCH channel of the corresponding TD-SCDMA of GSM of the present invention;

Fig. 4 carries out the frame structure schematic diagram of time synchronized between two systems for the present invention;

The schematic diagram that Fig. 5 is triggered by the hardware interrupts rising edge of GSM time processing unit for TD-SCDMA time processing unit in the preferred embodiment of the present invention.

Embodiment

Below in conjunction with accompanying drawing, will be elaborated to preferred embodiment of the present invention.

The GSM physical layer implementation method and the system of bimodulus baseband chip of the present invention, it comprises the bimodulus message data of the control section of GSMDSP and TD-SCDMA protocol stack mutual, and the bimodulus message data reciprocal process of GSM AS layer protocol stack.

Implementation method of the present invention and system have solved following problem: mutual measurement, time synchronized, interacting message during bimodulus between the different system; and how different system coexists during two bimodulus; and the independent operate as normal of difference; and GSM can either work under the GSM single-mode system, problem such as can work under the bimodulus environment again.

The core inventive point of implementation method of the present invention and system is, under the situation that does not influence the GSM single mode, can support dual mode capability on uniprocessor; Extraordinary and TD protocol stack carries out interaction; Time conversion between the different system and alignment; Measurement in the inventive method between the different system, gravity treatment, switch under the support of bottom software change more succinct.

As shown in Figure 1, the GSM side physical layer of bimodulus baseband chip of the present invention represents that with symbol L1G (Layer1 for GSM) it mainly comprises following module:

The asynchronous process module: this module mainly is responsible for interacting message and the work of treatment with gsm protocol stack and TD-SCDMA protocol stack.

Synchronous processing module: this module is by GSM frame down trigger, main be responsible for handling need work and the task planned in each GSM frame of physical layer, and handle the correlation function result that relevant TD-SCDMA calls.

Hardware drive module: the hardware module to gsm system inside drives, drives as time processing unit, and radio-frequency driven, battery-operated, low power consumption control or the like.

DSP control module: be responsible for the DSP of GSM calculation process module is controlled, comprise interface, task interaction mechanism, interruption, handshake method or the like.

In the GSM of bimodulus baseband chip of the present invention physical layer implementation method, GSM Master Mode is meant that handheld terminal is registered in the network of GSM, and the related software of GSM and hardware are in maximized mode of operation; GSM Slave Mode is meant that handheld terminal is registered in the network of TD-SCDMA, and the related software of GSM and hardware are in the minimized mode of operation.

The key point that L1G realizes in the inventive method comprises: 1, time processing unit TPU and the time processing unit TPU of TD-SCDMA inside of the time relationship of GSM and TD-SCDMA: GSM by control GSM inside realizes the deviation of frame between regularly between GSM and two systems of TD-SCDMA.2, GSM Master Mode:GSM is under idle pulley, and that can fix provides the free time of calculating, and by message informing TD-SCDMA, allows the TD-SCDMA system according to arrange by oneself task of this section period itself; When being in access or connection mode, then can arrange continuous idle IDLE frame to give TD-SCDMA, handle so that TD-SCDMA can carry out the task of itself if having time according to actual conditions as GSM.3, GSM Slave Mode:TD-SCDMA system can notify GSM free time time slot GAP by function, and help GSM to determine will carrying out at present of task: rssi measurement (Relative Signal Strength Indicator (relative signal intensity indicating device))/FCCH channel (requency Correction Channel, frequency correction channel, be GSM broadcast channel (broadcast channel, BCCH) part, carry the message that is used to proofread and correct the MS frequency) read/SCH channel (Sync Channel, synchronizing channel (SCH): reading or heavily the confirm information that transmission is carried out synchronously for travelling carriage and the base station is discerned).

Be illustrated in figure 1 as the system architecture schematic diagram that bimodulus of the present invention is realized, physical layer L1G comprises with the relation of each operational module in whole system in the inventive method: carry out interacting message with GRR (GSM Radio Resource) and TRRC (TD Radio Resource Conrtrol); Mutual with the shared drive district of TD correlation module and two systems by function; Wherein the working interface of L1G and GSM DSP needs the data interaction that shared drive carries out ARM and DSP, and has interrupt mechanism to carry out the handshake mechanism control of ARM and DSP, needs the working condition that state flag bit identifies both sides simultaneously.

L1G described in the inventive method and GRR have bimodulus message data mutual, described L1G and TD correlation module have message data mutual, described L1G can control the DSP subsystem of TD indirectly by the function that calls the TD side, and the software code of described L1G is supported the realization of single antenna and double antenna.

In the inventive method two kinds of processing modes are arranged in GSM physical layer L1G:

The one, GSM Slave Mode is the GSM slave mode, promptly when the TD-SCDMA standard is in holding state, the GSM physical layer lays under tribute, at this moment need the related software of TD-SCDMA to call the relevant bimodulus of GSM physical layer, the relevant processing of bimodulus that a newly-increased for this reason channel model is specifically designed to TD-SCDMA is referred to as COTDSCDMA.

Channel model is according to definition and the use of gsm protocol stack to the GSM logic channel, in the application of reality, these regulations is abstracted into channel model one by one, can simplify the realization of GSM physical layer like this.And when bimodulus, for can be,, finish the physical layer function of bimodulus to bimodulus so be that the action that the GSM physical layer need be finished also is abstracted into a channel model with single-mode system is corresponding before, need call corresponding channel model to get final product.

When GSM need handle the inter-related task of TD-SCDMA, GSM physical layer bimodulus channel model COTDSCDMA was activated, and handled the inter-related task of bimodulus then in this channel model, comprising: the 1) rssi measurement of GSM frequency; 2) the frequency calibration channel FCCH's of GSM reads; 3) synchronous channel SCH of GSM read and BSIC (BSIC-definition base station identity code Base Station Identity Code kind comprises PLMN colour coding and BCC.Be used to distinguish different network operators or the identical different districts of same network operator's Broadcast Control Channel frequency) affirmation and heavily confirm etc.

The basic function process example of COTDSCDMA comprises:

Initialization procedure:

void?11co_td_initialise_req(void)

UMTS (Universal Mobile Telecommunications System, meaning is a universal mobile telecommunications system) when doing the initial configuration of measurement, can call this function.

Activation:

void?11co_td_activate_req(void)

The activation primitive of COTDSCDMA when UMTS/TD need do measurement between pattern, promptly can call this function.Realize the configuration of Timer Unit and the skew of time; And following three actions of meeting reset:

11d_ncell_meas_stm_reset(MEAS_CO_TD)；

11d_lfcb_stm_reset(FALSE)；

11d_sync_stm_reset()；

The state machine example of COTDSCDMA is as follows:

typedef?enum

{

CO_STATE_NULL，

CO_STATE_CHANGE_PARAM，

CO_STATE_ACTIVATED_WAIT_FOR_START_FN，

CO_STATE_ACTIVATED_BUSY，

CO_STATE_ACTIVATED_RUNOUT，

CO_STATE_DEACTIVATION

}T_CO_STATE；

In the application of reality, above-mentioned state machine mainly is divided into following a few seed state:

IDLE: this sub-state is a dummy status, does not operate;

WAIT: this sub-state is a wait state, waits for the activation manipulation of oneself;

Prepare: this sub-state is being waited for executable operations for being activated;

BUSY: this sub-state is a task by just in executing state;

Result: this sub-state is for returning the execution result state;

Deactivation process:

void?11co_td_deactivate_req(void)

When time-out or stop mode measurements, can call this function.

The rssi measurement request process of the corresponding TD-SCDMA of GSM comprises TD primary module execution function 11co_td_rssi_meas as shown in Figure 2 in the inventive method, and corresponding implementation: according to registered events ID request for data structure space; The skew of computing time and task starting time; The largest cell number of the interior energy measurement of clearance G AP computing time; Activate 11co_td_rssi_frame_tick.

This activation realizes by GSM frame interrupt call 11co_td_frame_tick function, thus executing state machine: STATE_RSSI_IDLE; STATE_RSSI_WAIT; STATE_RSSI_PREPARE; STATE_RSSI_WAIT_RESULT.

In the inventive method, the measurement request process of the FCCH/SCH signal of the corresponding TD-SCDMA of GSM, as shown in Figure 3, it comprises TD primary module execution function 11co_td_fcb_sb_read, and corresponding implementation: according to registered events ID request for data structure space; The zero-time of computing time skew and task; According to state machine state STATE_FCB_SB_IDLE and incident START_FCB_SEARCH, activate 11co_td_fcb_sb_frame_tick.

This activation is called 11co_td_frame_tick by GSM frame terminal, carries out function 11co_td_fcb_sb_frame_tick, and to cell list executing state machine process: STATE_FCB_SB_IDLE successively; STATE_FCB_WAIT; STATE_FCB_PREPARE; STATE_FCB_RESULT, and judge whether FCB reads correct, if then continue to carry out following state machine process: STATE_SB_READ; STATE_SB-WAIT; STATE_SB_PREPARE; STATE_SB_RESULT.

The 2nd, GSM Master Mode, promptly GSM is a master mode, promptly when the GSM standard was in holding state, the TD-SCDMA physical layer laid under tribute.At this moment the GSM physical layer responds the message of coming from the gsm protocol stack, and relevant acknowledge message is returned to gsm protocol stack or TD-SCDMA protocol stack.

Claims

1. the implementation method of a double-mode GSM physical layer system, it may further comprise the steps:

B, under GSM is main pattern, GSM controls to selling the TD-SCDMA system and arranges by oneself the time that task own handles; Under the pattern of GSM subordinate, the TD-SCDMA system can notify GSM the free time time slot by function, and help GSM to determine following will carrying out of the task of subordinate pattern, and under the pattern of GSM subordinate, the task that GSM will carry out comprises the following steps of rssi measurement process: B31, TD primary module execution function 11co_td_rssi_meas, and according to registered events ID request for data structure space, the skew of computing time and task starting time, the largest cell number of the interior energy measurement of clearance G AP computing time; B32, activation 11co_td_rssi_frame_tick, this activation realizes by GSM frame interrupt call 11co_td_frame_tick function, thus executing state machine: STATE_RSSI_IDLE; STATE_RSSI_WAIT, STATE_RSSI_PREPARE, STATE_RSSI_WAIT_RESULT.

2. method according to claim 1 is characterized in that, described step B also comprises:

B1, under GSM is main pattern, and during idle pulley, provide the fixing free time of calculating, and by message informing TD-SCDMA system.

3. method according to claim 1 is characterized in that, described step B also comprises:

4. method according to claim 1, it is characterized in that, described step B also is included under the pattern of GSM subordinate, the task that GSM will carry out comprises the request process of FCCH/SCH channel: the TD primary module is carried out function 11co_td_fcb_sb_read, and according to registered events ID request for data structure space, the zero-time of computing time skew and task, according to state machine state STATE_FCB_SB_IDLE and incident START_FCB_SEARCH, activation 11co_td_fcb_sb_frame_tick.

5. method according to claim 4, it is characterized in that, the process of described activation 11co_td_fcb_sb_frame tick is called 11co_td_frame_tick by GSM frame terminal, carry out function 11co_td_fcb_sb_frame_tick, and to cell list executing state machine process: STATE_FCB_SB_IDLE successively; STATE_FCB_WAIT; STATE_FCB_PREPARE; STATE_FCB_RESULT, and judge whether FCB reads correct, if then continue to carry out following state machine process: STATE_SB_READ; STATE_SB-WAIT; STATE_SB_PREPARE; STATE_SB_RESULT.

6. double-mode GSM physical layer system, it is included in, and to carry out function mutual and carry out the GSM physical layer of interacting message with gsm wireless resource GRR and TD Radio Resource control TRRC with the TD correlation module; It is characterized in that the setting of described GSM physical layer comprises:

Synchronous processing module, be used for by GSM frame down trigger, and interior work and the task of planning of each GSM frame of handling physical layer, and the relevant TD-SCDMA call function result of processing, specifically comprise: under GSM was main pattern, GSM controlled to selling the TD-SCDMA system and arranges by oneself the time that task own handles; Under the pattern of GSM subordinate, the TD-SCDMA system can notify GSM the free time time slot by function, and help GSM to determine following will carrying out of the task of subordinate pattern, and under the pattern of GSM subordinate, the task that GSM will carry out comprises the following steps of rssi measurement process: B31, TD primary module execution function 11co_td_rssi_meas, and according to registered events ID request for data structure space, the skew of computing time and task starting time, the largest cell number of the interior energy measurement of clearance G AP computing time; B32, activation 11co_td_rssi_frame_tick, this activation realizes by GSM frame interrupt call 11co_td_frame_tick function, thus executing state machine: STATE_RS_SI_IDLE; STATE_RS_SI_WAIT, STATE_RS_SI_PREPARE, STATE_RSSI_WAIT_RESULT;

7. system according to claim 6 is characterized in that, the driving of described Hardware drive module comprises hardware driving and the low power consumption control that uplink downlink is relevant.

8. system according to claim 7 is characterized in that, the control of described DSP control module comprises interface, task interaction mechanism, interruption and handshake method.

9. system according to claim 8 is characterized in that, the time processing unit of TD-SCDMA system can be triggered by the hardware interrupts rising edge of the time processing unit of gsm system, comes the synchronous and conversion time to the time timing point of deposited two different systems with this.