CN1277361C - Method for receiving mobile station reverse channel quality indicating channel of CDMA base station - Google Patents

Abstract

A method for code division multiple access base station receiving mobile station reverse channel quality indication, in a system composed of base station controller including selection distribution unit, multiple base station transceivers including packet data channel control function unit, and mobile station , by simultaneously receiving the reverse channel quality indicator channel information in all corresponding BTSs supporting the forward packet data channel in the current active set pilot of the mobile station, and combining active reporting and passive query, information synthesis is performed in the base station controller, And in front of the mobile station, it performs real-time update to the working BTS of the packet data channel, so as to realize the reception of the CQI information sent by the mobile station. It can avoid a large number of messages reporting CQI information at the Abis port; it can maximize the receiving capability of the system to maximize the accuracy of CQI information; and maximize the timeliness of CQI information.

Description

Method for code division multiple access base station to receive reverse channel quality indication of mobile station

technical field

The present invention relates to the field of CDMA (Code Division Multiple Access) mobile communication, in particular to a method for receiving a Reverse Channel Quality Indicator (Reverse Channel Quality Indicator Channel) by a base station in a CDMA 1XEV-DV (1 carrier enhanced data and voice) system.

Background technique

The CDMA 1XEV-DV system is an upgraded device of the CDMA 1X system. It can provide voice and data services at the same carrier frequency. On the basis of being fully compatible with CDMA 1X functions, the forward wireless data transmission rate can theoretically reach up to '3.1Mbps/ This is mainly due to the fact that the newly added forward packet data channel in the CDMA 1XEV-DV system adopts a modulation technology with higher spectrum efficiency, and then through the forward packet data control channel and the reverse channel quality indicator channel Used in conjunction with the reverse acknowledgment channel, HARQ (Hybrid Request-Acknowledgment) and AMC (Automatic Adaptive Control Coding) and other transmission quality control mechanisms are implemented, making the CDMA1XEV-DV system adaptable to various complex operating environments and practical The transfer rate can reach '1Mbps/carrier sector'.

Each packet sent to the forward packet data channel must set a certain modulation mode, including parameters such as time slot length, modulation order and number of WALSH code channels. The setting of these parameters determines the expected data parameter rate and transmission of the channel. Anti-interference ability, the expected data transmission rate of the modulation mode and the anti-interference ability of the transmission are inversely proportional, so if the expected data parameter rate is increased blindly, the anti-interference ability of the transmission will be reduced, thereby increasing the packet transmission failure rate, making the actual On the contrary, if the transmission anti-interference ability is blindly improved, the transmission capacity will be wasted. Only by setting the modulation mode reasonably can the transmission capacity of the forward packet data channel be maximized.

In view of the aforementioned problems, the coding mechanism of automatic adaptive control requires the base station to adjust the modulation mode used for sending packets on the forward packet data channel at any time according to the situation of the mobile station receiving the forward signal, so that the current modulation mode can achieve high enough transmission reliability. And on the basis of ensuring the success rate of packet transmission, the expected data transmission rate as high as possible is adopted.

Due to the complexity of the wireless transmission environment, the situation of the mobile station receiving the forward signal is a factor that changes at any time, which is especially obvious when the mobile station moves at high speed, and because there is a 10MHZ～190MHZ frequency between the reverse wireless links before and after CDMA. frequency interval, so the base station cannot accurately estimate the situation of the forward signal received by the mobile station based on the strength of the received reverse signal sent by the mobile station, and this is the key to realize the coding mechanism of automatic adaptive control. In CDMA In the 1XEV-DV system, the mobile station reports the forward signal strength information received by itself to the base station at an interval of 1.25 milliseconds on the reverse channel quality indication channel, and the base station uses the received information as the basis for determining the modulation mode of the forward packet data channel The basis to realize the adaptive control of the coding mechanism of automatic adaptive control.

The base station accurately and timely receives the forward signal strength information sent by the mobile station on the reverse channel quality indicator channel, which is the basis for the effective function of the coding mechanism of the base station automatic adaptive control and the realization of a higher forward data transmission rate.

Contents of the invention

The technical problem to be solved by the present invention is to implement a method for receiving the reverse channel quality indication of the mobile station at the base station, so as to achieve the purpose of accurately and timely receiving the forward signal strength information sent by the mobile station.

In the present invention, in a system composed of a base station controller including a selection distribution unit, a plurality of base station transceivers including a packet data channel control function unit, and a mobile station, the method for the base station to receive the reverse channel quality indication of the mobile station includes the following step:

1.1 After the base station allocates a forward packet data channel to the mobile station, it creates a quality indication information receiver unit in all corresponding base station transceivers that support the forward packet data channel in the current active set pilot of the mobile station;

1.2 The quality indication information receiver unit continuously demodulates the reverse channel quality indication transmitted by the mobile station at the same time, and records the received CQI (channel quality indication) information, and then processes it respectively according to the following conditions:

1) Immediately send the latest CQI information to the SDU (selection distribution unit) unit of the BSC (base station controller) upon receiving the cell switching information sent by the mobile station; or

2) When receiving the CQI information query command sent by the selection distribution unit, immediately return the latest CQI information; or

3) When receiving the CQI information query command sent by the PDCHCF (packet data channel control function) unit of the base transceiver station, return the latest CQI information immediately;

1.3 After the SDU receives a packet that does not have special requirements for real-time performance from the PCF (packet control function unit), it will send a query command to all CQI_RECEIVERs that support F-PDCH sectors in the current active set of the mobile station. After receiving each CQI_RECEIVER return After the latest CQI information of the mobile station, the CQI information is synthesized, and the synthesized CQI information is sent together with the packet data packet to the PDCHCF of the current F-PDCH serving sector of the mobile station; or

When the SDU is transmitting packets sent by the PCF that require high real-time performance, such as video streaming services, the SDU will automatically and periodically query the working mode of the CQI information. After receiving the packets sent by the PCF, use The recently synthesized CQI information is used as the basis for sending the packet, and sent to the PDCHCF together with the packet; or

When the SDU receives the CQI information sent by a certain PDCHCF or CQI_RECEIVER indicating that the mobile station is currently performing a cell switching operation, set the target F-PDCH working sector of the mobile station to the current F-PDCH working sector of the mobile station, Subsequent packets sent to the mobile station will be sent to the mobile station through the PDCHCF of the sector, and at the same time, a command to terminate cell switching will be sent to the mobile station through the F-PDCCH. After the mobile station receives the command or the timer expires, It will exit the cell conversion process and enter the normal working state in the target sector;

1.4 After the packet data channel control function unit receives the packet and its CQI information to be sent to a certain mobile station sent by the selection distribution unit, it sends a channel quality indication query command to the quality indication receiver unit, and uses the channel quality indication receiver unit The latest CQI information returned by the unit and the CQI information sent by the selected distribution unit are combined, and the combined CQI information is used as the basis for determining the packet modulation mode; or

Based on the synthesized latest CQI information, it is found that the WALSH code adopted by the mobile station has changed, and the latest CQI information is sent to the selection and distribution unit.

In the scheme of the present invention:

After the base station creates quality indication information receiver units in all corresponding base station transceivers supporting forward packet data channels in the current active set pilot of the mobile station, it will also adjust each BTS (base station) in time according to the change of the active set of the mobile station. Transceiver) The setting of the channel quality indication receiver unit, that is: the channel quality indication receiver unit is set at the corresponding BTS of the newly added effective pilot support forward packet data channel, and the pilot frequency support forward packet data of the active set will be withdrawn The channel quality indication receiver unit of the corresponding BTS of the channel is turned off to ensure that all corresponding BTSs supporting the forward packet data channel in the current active set pilot of the mobile station have a channel quality for receiving the reverse channel quality indication of the mobile station Indicates the receiver unit.

The channel quality indication receiver demodulates the reverse channel quality indication transmitted by the mobile station, including: the WALSH code used by the mobile station in the current time slot for WALSH mask processing on the reverse channel quality indication channel, and the current time slot Channel quality indicator report value.

The quality indication information receiver unit sends or returns the latest CQI information to the selection distribution unit, which refers to the CQI information of the current 20 millisecond frame. If the current time slot is time slot 0, it will be recorded together with the channel quality indication of the previous 20 millisecond time slot send together.

The synthesis of the CQI information is to select and re-integrate the CQI information correctly received by each channel quality indicator receiver, so as to obtain a CQI information record as accurate as possible.

All corresponding BTSs in the current active set pilot of the mobile station that do not support the forward packet data channel will not participate in the power control of the mobile station, that is, always send the 'UP' instruction that requires the mobile station to increase the power.

In the present invention, all corresponding BTSs supporting the forward packet data channel in the current active set pilot of the mobile station receive the reverse channel quality indication channel information at the same time, and carry out information synthesis in the base station controller by combining active reporting and passive query , and perform real-time update to the working BTS of the packet data channel in front of the mobile station to realize the reception of the CQI information sent by the mobile station, which has the following advantages:

1. At any time, there is only one working BTS for the forward packet data channel of the mobile station. Due to the large interval between the transmission frequency bands of the forward and reverse wireless links, the probability of imbalance is relatively high. Under the effect of reverse power control, It is likely that the channel quality indication receiver of the mobile station's forward packet data channel working BTS cannot correctly receive the reverse channel quality indication channel signal sent by the mobile station. In the present invention, all supported front Simultaneously receive the reverse channel quality indication channel information to the corresponding BTS of the packet data channel, and synthesize the CQI information in the selected distribution unit. Through the function of reverse power control, the error rate of the base station receiving the CQI information can be controlled within an acceptable range At this time, the problem of unbalanced front reverse link will basically not affect the reception of CQI information.

Although there will be a certain delay in the combined CQI information due to the synthesis of channel quality indication queries, but through the BTS working on the forward packet data channel to perform the final CQI information update operation, the problem of forward and reverse imbalance does not exist In the case of a lesser degree, the delay problem of CQI information can basically be eliminated. For the case where the imbalance between the forward and reverse is more serious, the CQI information update operation cannot eliminate the delay problem of CQI information. This can be considered as the The necessary loss caused by the reverse imbalance problem and the possible impact of the CQI information delay can be estimated as follows: Assuming that the mobile station is moving at a speed of '100 km/h', the query synthesis process of the channel quality indicator brings 20 If the time delay is milliseconds, the mobile station can move 0.56 meters during this time period. It can be seen that the influence of channel quality indication time delay on the accuracy of CQI information should be acceptable.

Since the selection and distribution unit needs to collect and synthesize CQI information before sending the packet to the packet data channel control function of the base transceiver station, it will bring some time delay to the packet sending, and the real-time requirements For data services that are not very high, the impact should not be too great, but for services with high real-time requirements, such as video streaming services, since the distribution unit is selected to use the working mode of automatically and periodically querying CQI information, the packet The timeliness of packet sending, although the timeliness of CQI information is slightly lost, but based on the previous analysis, it can be known that this loss should be within an acceptable range.

2. The interval of the CQI information sent by the mobile station in the reverse channel quality indication channel is 1.25 milliseconds. In the present invention, the channel quality indication receiver of the base transceiver station receives the query command for selecting the distribution unit, or The CQI information is reported only after the mobile station enters the cell switching state. This working method can avoid a large number of CQI information reporting messages on the Abis port.

3. Selecting the distribution unit to synthesize and process the CQI information received from each channel quality indicator receiver, which can maximize the receiving capability of the system and maximize the accuracy of the CQI information.

4. After the packet data channel control function receives the combined CQI information sent by the selection and distribution unit, it will also perform an update operation of the CQI information to maximize the timeliness of the CQI information.

Description of drawings

Figure 1 is a schematic diagram of the function realization of the CDMA 1XEV-DV base station system receiving the reverse channel quality indication;

Fig. 2 is a flow chart of processing for selecting a distribution unit to send a packet.

Detailed ways

The basic ideas of the present invention are as follows: in the CDMA 1XEV-DV system, the CQI information sent by the mobile station on the reverse channel quality indication channel is the basis for the base station to decide to send the packet modulation mode on the forward packet data channel, and the base station receives the CQI information The accuracy of information has a key impact on the data transmission speed of the forward packet data channel. Since the unbalanced transmission conditions of the forward and reverse links are common, the BTS where the forward packet data channel currently monitored by the mobile station may not receive it correctly. The CQI information sent by the mobile station on the reverse channel quality indicator channel can correctly receive the BTS that the mobile station sends the CQI information on the reverse channel quality indicator channel, and does not send the forward packet data channel packet to the mobile station, and this The ability to receive CQI information changes at any time and is unpredictable, so all corresponding BTSs that support forward packet data channels in the current active set pilot of the mobile station create a channel quality indication receiver unit that receives the reverse channel quality indication of the mobile station , to ensure that the base station can receive the CQI information as accurately as possible under various circumstances, and the selection distribution unit synthesizes the CQI information received by each channel quality indicator receiver unit, so as to maximize the accuracy of the CQI information change.

On the basis of the above-mentioned basic ideas, several performance optimization measures have been adopted, including: (1) Considering that the frequency of CQI information reported by the mobile station is relatively high, in order to reduce the data transmission flow of the Abis port, the channel quality indication receiver unit will The CQI information reporting selection distribution unit adopts a combination of passive query and active reporting; (2) In order to reduce the time delay of the CQI information, when the BTS that sends the packet to the mobile station, the packet data channel control function is sent after receiving the selection distribution unit. After receiving the incoming CQI information, the final update operation will be carried out; (3) In order to meet the requirements of real-time services on processing delay, the selection distribution unit provides a working mode for periodically querying CQI information; (4) In order to ensure that the current active set of mobile stations The channel quality indication receiver unit of the corresponding BTS that supports the forward packet data channel in the pilot can correctly receive the CQI information sent by the mobile station, so that all corresponding BTSs that do not support the forward packet data channel in the current active set pilot of the mobile station Does not participate in power control for the mobile station.

The function of CDMA 1XEV-DV base station system receiving reverse channel quality indication is shown in Figure 1. After the base station assigns the forward packet data channel to the mobile station, the mobile station will continue to send CQI on the reverse channel quality indication channel. At the same time, the base station creates a channel quality indication receiver unit for receiving the reverse channel quality indication of the mobile station in all corresponding BTSs that support the forward packet data channel in the current active set pilot of the mobile station. According to the provisions of the agreement, the mobile station can at most Do 6-party soft handover, that is, the active set of the mobile station can have up to 6 pilots, so for a certain mobile station, there may be up to 6 channel quality indication receiver units that receive the reverse channel quality indication sent by it at the same time . During the activation process of the mobile station, various forms of switching actions may occur, resulting in changes in the active set. The base station will adjust the settings of the channel quality indication receiver units of each BTS in time according to the change of the active set of the mobile station, including: Add the corresponding BTS with valid pilots supporting the forward packet data channel to set the channel quality indication receiver unit, and turn off the channel quality indicator receiver unit of the corresponding BTS with the pilots that exit the active set and support the forward packet data channel. The goal is to It is ensured that all corresponding BTSs supporting the forward packet data channel in the current active set pilot of the mobile station have a channel quality indicator receiver unit for receiving the reverse channel quality indicator channel of the mobile station. The channel quality indication receiver unit will send the demodulated CQI information to the selection distribution unit of the base station controller or the packet data channel control function unit of the BTS in a combination of passive query response and active report, the selection distribution unit and The packet data channel control function unit will use the CQI information sent by the channel quality indication receiver to send the forward packet data channel packet, and the selection and distribution unit will also obtain the relevant information of the mobile station's cell switching from it, so as to execute the corresponding processing flow .

After the channel quality indication receiver unit is created, it will continue to demodulate the reverse channel quality indication transmitted by the mobile station. The demodulation content includes: the current time slot mobile station uses the reverse channel quality indication channel for WALSH mask processing WALSH code, and the channel quality indicator report value of the current time slot, and record the received CQI information according to the following rules:

CQI information record of the previous 20ms frame: time slot Slot 0 (previous 20ms frame boundary) time slot 1 time slot 2 slot 3 … slot 15 channel quality indicator Full Channel Quality Indicator Full CQI or Differential CQI bit error Full CQI or Differential CQI … Full CQI or Differential CQI Walsh code Walsh code Walsh code bit error Walsh code … Walsh code

Current 20ms frame CQI information record 1: time slot Slot 0 (nearest 20ms frame boundary) time slot 1 Time slot 2 (current time slot) slot 3 … slot 15 channel quality indicator Full Channel Quality Indicator Full CQI or Differential CQI bit error No hair … No hair Walsh code Walsh code Walsh code bit error No hair … No hair

The record table saves the reception of all channel quality indications in the current 20 millisecond frame and the previous 20 millisecond frame, and the record takes 1.25 millisecond time slots as the unit, where 'error' means that the channel quality indication receiver unit failed to correct the time slot in this time slot The channel quality indicator is received, and 'not sent' means that the time slot has not come yet. The channel quality indication receiver unit monitors the reverse channel quality indication channel at any time for WALSH masking to process the change of the WALSH code. If the WALSH code of the current time slot is found to be different from that of the previous time slot, the current 20 millisecond frame The CQI information record is sent to the selection distribution unit. If the query command sent by the selection distribution unit is received, the channel quality indication receiver will send the CQI information record of the current 20 ms frame to the selection distribution unit, if the current time slot is time slot 0, together with the previous 20 ms time slot The channel quality indicator records are sent together. If the query command sent by the BTS packet data channel control function unit is received, the channel quality indication receiver will send the CQI information record of the current 20 millisecond frame to the selection distribution unit, if the current time slot is time slot 0, together with the previous A 20 millisecond slot of CQI records is sent together. In order to reduce unnecessary data transmission, if the forward packet data channel currently monitored by the mobile station is in the same BTS as the channel quality indicator receiver, or there is no correctly received CQI in the CQI information record that the channel quality indicator receiver requires to send information, the channel quality indication receiver will not respond to the inquiry command of the selection distribution unit.

After the selection and distribution unit receives the packet that needs to be sent to the mobile station from the packet control function, if it is determined that the packet needs to be sent through the forward packet data channel, the processing flow of the selection and distribution unit is shown in Figure 3. The selection and distribution unit first sends a message to all The CQI receiver receiving the CQI information of the mobile station sends an inquiry command, and then waits for the CQI receiver to return the latest CQI information. If the selection and distribution unit does not receive the CQI information returned by the channel quality indicator receiver after the waiting timer expires, the selection and distribution unit will generate an empty CQI information record by itself, and send the CQI information record together with the packet to the current channel. Packet data channel control function unit for mobile station to send forward packet data channel packets. If the selection and distribution unit receives the CQI information returned by the channel quality indication receiver before the waiting timer expires, the selection and distribution unit will synthesize the CQI information returned by each channel quality indication receiver, as follows:

Channel quality indication synthesis: Channel Quality Indicator Receiver Number slot 0 time slot 1 time slot 2 slot 3 … slot 15 0 Full Channel Quality Indicator 0 bit error bit error No hair … No hair 2 bit error bit error Full CQI or Differential CQI2 No hair … No hair 3 bit error Full channel quality indicator or differential channel quality indicator1 bit error No hair … No hair composite channel quality indicator Full Channel Quality Indicator 0 Full channel quality indicator or differential channel quality indicator1 Full CQI or Differential CQI2 No hair … No hair

WALSH code synthesis: Channel Quality Indicator Receiver Number slot 0 time slot 1 time slot 2 slot 3 … slot 15 0 WALSH code 0 bit error bit error No hair … No hair 2 bit error bit error WALSH code 2 No hair … No hair 3 bit error WALSH code 1 bit error No hair … No hair Synthetic WALSH code WALSH code 0 WALSH code 1 WALSH code 2 No hair … No hair

The synthesis of CQI information is to select the CQI information correctly received by each channel quality indicator receiver and then reintegrate it. The selection method is shown in the above table. Each row in the above table is the CQI information received by a channel quality indicator receiver, because These receivers receive the same signal. If all receivers can receive correctly, then all receivers receive the same thing, but due to the influence of interference, each receiver may not be able to receive all signals completely. The signal may only be received by receiver 1 in time slot 1, and only receiver 0 in time slot 2. In this way, all correct results are summed up to obtain a result that is as correct as possible. Through CQI information synthesis processing, the effect of CQI information diversity reception is achieved, which is very effective for coping with complex and changeable wireless environments. After the selection and distribution unit completes CQI information synthesis, it sends the CQI synthesis information together with the packet to the packet data channel control function unit currently sending the forward packet data channel packet to the mobile station.

If the selected distribution unit needs to transmit services with high real-time requirements, such as video streaming services, the mode of querying the CQI information of the selected distribution unit needs to be adjusted accordingly, and the selected distribution unit will automatically and periodically indicate the quality of each channel to the receiver Send the CQI information query command, and periodically synthesize the CQI information, and at the same time select the distribution unit to send the newly synthesized CQI information together with the packet to the packet data channel control function after receiving the packet sent by the packet control function .

If the selection and distribution unit finds that the WALSH code used by the mobile station has changed after analyzing the synthesized WALSH code record, it indicates that the mobile station is currently performing cell switching operations, and the selection and distribution unit will use the WALSH code newly adopted by the mobile station. Determine the target BTS for the cell switching of the mobile station, and set the working target BTS of the forward packet data channel of the mobile station cell switching as the current working BTS of the forward packet data channel of the mobile station, and at the same time send a termination cell switching signal to the mobile station through the F-PDCH command, the mobile station will exit the cell switching process after receiving the command or the timer expires, and enter the normal working state at the target BTS, and the packet sent to the mobile station will pass through the packet data channel control function of the BTS sent to the mobile station. If the selection distribution unit receives the CQI information record returned by the channel quality indication receiver unit or the packet data channel control function unit without sending the channel quality indication query command, the selection distribution unit will receive the first CQI information record message Afterwards, immediately judge the cell switching state of the mobile station, and if it is determined that the mobile station is in the process of cell switching, immediately begin to execute the processing flow of cell switching.

After the packet data channel control function unit receives the packet and CQI information to be sent to a mobile station sent by the selection and distribution unit, it will send a channel quality indication to the channel quality indication receiver unit of the BTS that receives the CQI information of the mobile station Query command, the packet data channel control function will use the latest CQI information returned by the channel quality indication receiver unit and the CQI information sent by the selected distribution unit to be synthesized, as shown below:

Channel quality indication synthesis: Channel Quality Indication Type slot 0 time slot 1 time slot 2 slot 3 … slot 15 Select the channel quality indicator record sent by the distribution unit Full Channel Quality Indicator 0 bit error Full CQI or Differential CQI2 No hair … No hair The channel quality indication record returned by the BTS channel quality indication receiver bit error Full channel quality indicator or differential channel quality indicator1 bit error Full channel quality indicator or differential channel quality indicator3 … No hair Latest channel quality indication record Full Channel Quality Indicator 0 Full channel quality indicator or differential channel quality indicator1 Full CQI or Differential CQI2 Full channel quality indicator or differential channel quality indicator3 … No hair

WALSH code synthesis: Walsh code type slot 0 time slot 1 time slot 2 slot 3 … slot 15 Select the WALSH code record sent by the distribution unit WALSH code 0 bit error WALSH code 2 No hair … No hair The WALSH code record returned by the BTS channel quality indication receiver bit error WALSH code 1 bit error WALSH code 3 … No hair Latest Walsh code record WALSH code 0 WALSH code 1 WALSH code 2 WALSH code 3 … No hair

The principle is the same as that of CQI information synthesis for selecting a distribution unit.

In addition to making the CQI information more accurate, it also achieves the goal of making the CQI information as updated as possible, and the latest CQI information after synthesis is used as the basis for determining the packet modulation mode. The packet data channel control function unit will also analyze the change of the WALSH code of the newly synthesized CQI information. If it is found that the WALSH code adopted by the mobile station has changed, the packet data channel control function unit will send the latest CQI information to the selective distribution network. unit, to notify the selection and distribution unit of the processing flow of cell switching.

If there are BTSs that do not support the forward packet data channel among the BTSs corresponding to the active set pilots of the mobile station, then it is impossible to create channel quality indicator receiver units in these BTSs. Under the effect of reverse power control, it is likely that no channel quality indicator receiver can correctly receive the CQI information. At this time, the forward packet data channel will not be able to send packets to the mobile station. To solve this problem, It is necessary to prevent the BTS that does not support the forward packet data channel from participating in the reverse power control of the mobile station, and make the power control indication sent by the BTS continue to be 'UP'. Although this may increase the occupation of the reverse channel capacity by the mobile station, However, it is guaranteed that the base station sends packets to the mobile station via the forward packet data channel in this case.

The method involved in the present invention is mainly aimed at the situation that there are multiple pilots in the active set of the mobile station, and is used to solve the problem that the base station may encounter inconsistencies in the previous reverse link transmission conditions when receiving the reverse channel quality indication sent by the mobile station. The problem of balance, this problem all exists equally when mobile station carries out soft handover, softer handover and soft handover between base station controllers, and the method involved in the present invention can well adapt to these several situations, and can bring into play expected effect, In the non-soft handover state, the mobile station has only one effective pilot frequency, and the influence brought by the unbalanced transmission conditions of the previous reverse link can be eliminated through the reverse power control, and the compatibility of the system design can be improved by applying the method involved in the present invention , without adverse effects.

Claims (5)

1. The method for receiving mobile station reverse channel quality indication by CDMA base station, comprising a base station controller comprising a selection distribution unit, a plurality of base station transceivers comprising a packet data channel control function unit and a channel quality indication receiver, In a system consisting of mobile stations, the following steps are taken: 1.1 After the base station allocates a forward packet data channel to the mobile station, it creates a channel quality indication receiver unit in all corresponding base station transceivers that support the forward packet data channel in the current active set pilot of the mobile station; 1.2 The channel quality indication receiver unit continuously demodulates the reverse channel quality indication transmitted by the mobile station and the WALSH code used for WALSH mask processing, and records the received channel quality indication information, and then according to The following cases are handled separately: 1) Upon receiving the cell switching information sent by the mobile station, immediately send the latest channel quality indication information to the selection distribution unit of the base station controller; or 2) When receiving the channel quality indication information query command sent by the selection distribution unit, immediately return the latest channel quality indication information; or 3) When receiving the channel quality indication information query command sent by the packet data channel control function unit of the base transceiver station, immediately return the latest channel quality indication information; 1.3 After the selection and distribution unit receives the packet that does not have special requirements for real-time performance from the packet control function unit, it sends a query command to all channel quality indicator receivers in the current active concentration of the mobile station that support the forward packet data channel sector. After the latest channel quality indication information returned by each channel quality indication receiver, the channel quality indication information is synthesized, and the synthesized channel quality indication information is sent together with the packet data packet to the current forward packet data channel of the mobile station the packet data channel control functional unit of the serving sector; or When the selection and distribution unit transmits the packet with high real-time requirements sent by the packet control function unit, the selection and distribution unit will automatically and periodically send channel quality indication information to each channel quality indication receiver, and periodically synthesize the channel quality indication information", after receiving the packet sent by the packet control functional unit, use the recently synthesized channel quality indication information as the basis for sending the packet, and send it together with the packet to the packet data channel control functional unit; or When the selection and distribution unit receives the channel quality indication information sent by a certain packet data channel control function unit or channel quality indication receiver indicating that the mobile station is currently performing a cell switching operation, it will work on the target forward packet data channel of the mobile station The sector is set as the current forward packet data channel working sector of the mobile station, and the subsequent packet sent to the mobile station will be sent to the mobile station through the packet data channel control function unit of the sector, while the forward packet data The channel sends a command to terminate the cell switching to the mobile station. After receiving the command or the timer expires, the mobile station will exit the cell switching process and enter the normal working state in the target sector; 1.4 The packet data channel control function unit sends the channel quality indication query command to the channel quality indication receiver unit after receiving the packet packet and its channel quality indication information to be sent to a certain mobile station sent by the selection and distribution unit, and uses the channel quality indication Instructing the latest channel quality indication information returned by the receiver unit to be combined with the channel quality indication information sent by the selected distribution unit, and using the combined channel quality indication information as the basis for determining the packet modulation mode; or Based on the synthesized latest channel quality indication information, it is found that the WALSH code adopted by the mobile station has changed, and the latest channel quality indication information is sent to the selection and distribution unit. 2. The method for the CDMA base station of claim 1 to receive the mobile station reverse channel quality indication, characterized in that: the base station transmits and receives signals to all corresponding base stations that support the forward packet data channel in the current active set pilot of the mobile station After creating the channel quality indication receiver unit in the machine, according to the change of the active set of the mobile station, adjust the setting of the channel quality indication receiver unit of each base transceiver station in time, that is: when the new effective pilot supports the forward packet data channel The channel quality indicator receiver unit of the corresponding base station transceiver is set, and the channel quality indicator receiver unit of the corresponding base station transceiver that exits the active set pilot and supports the forward packet data channel is turned off. 3. The method for receiving a mobile station reverse channel quality indication by a code division multiple access base station according to claim 1, wherein the content that the channel quality indication receiver demodulates the reverse channel quality indication channel transmitted by the mobile station includes : The reported value of the channel quality indicator information of the current time slot. 4. The method for receiving a mobile station reverse channel quality indication by a code division multiple access base station according to claim 1, characterized in that: said quality indication information receiver unit sends or returns the latest channel quality indication information to the selection distribution unit, It refers to the channel quality indication information of the current 20 millisecond frame. If the current time slot is time slot 0, it is sent together with the channel quality indication record of the previous 20 millisecond time slot. 5. The method for receiving a mobile station reverse channel quality indication by a code division multiple access base station according to claim 1, characterized in that: the synthesis of said channel quality indication information is the channel quality correctly received by each channel quality indication receiver The indication information is selected and reintegrated, so as to obtain a record of channel quality indication information as accurate as possible.

Images