WO2005041434A1

WO2005041434A1 - Radio receiver apparatus and finger assigning method

Info

Publication number: WO2005041434A1
Application number: PCT/JP2004/015630
Authority: WO
Inventors: Koichi Aihara; Hideki Kanemoto
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 2003-10-24
Filing date: 2004-10-21
Publication date: 2005-05-06
Also published as: JP2005130246A; JP3665322B2

Abstract

A radio receiver apparatus wherein an improvement has been achieved in demodulation performance in a case of receiving radio signals of a plurality of channels having different characteristics. In the apparatus, a correlation circuit (103) produces a delay profile of a desired cell from a received signal. A DPCH path table management circuit (104) and an HSDPA path table management circuit (106) produce, based on the delay profile, path management tables so as to assign fingers to the received DPCH and HSDPA channels. A DPCH finger assigning part (105) and an HSDPA finger assigning part (107) assign, based on the path management tables, the fingers to the multipaths of the channels, and output the assignment results to a DPCH circuit (110a) and an HSDPA circuit (110b), which perform correlation operations, demodulations and the like for the channels.

Description

Specification

Wireless receiver and finger assignment method

Technical field

The present invention relates to a mobile station device used in a communication system adopting an HSDPA (High Speed Downlink Packet Access) method, and a finger assignment method used when performing rake combining in this device.

Background art

[0002] Conventionally, as a higher-speed packet data transmission method of the IMT-2000, a method called HSDPA (High Speed Downlink Packet Access) for the purpose of increasing the downlink peak transmission speed, reducing the transmission delay, and increasing the throughput, etc. Is being considered.

[0003] A general communication sequence in a communication system employing the HSDPA scheme will be described below. The mobile station receives downlink CPICH (Common Pilot Channel), generates CQI (Channel Quality Indicator) information that is information on reception quality, and uses uplink HS-DPCCH (High Speed-Dedicated Physical Control Channel). Report to base station. At this time, the transmission power of the HS-DPCCH uses a value obtained by adding an offset to the power of the uplink DPCH, which also requires a TPC (Transmission Power Control) command used for transmission power control of the downlink DPCH (Dedicated Physical Channel). ing. In addition, the mobile station receives the HS-SCCH (High Speed-Shared Control Channel) and checks whether or not the HSDPA communication packet addressed to the mobile station is being transmitted. Then, when a communication packet addressed to the own station has been transmitted, HS-PDSCH (High Speed-Physical Downlink Shared Channel) is received. HS-SCCH and HS-PDSCH are not power-controlled. The mobile station reports an ACK signal or a NACK signal resulting from the reception of the HS-DSCH to the base station using the uplink HS-DPCCH.

[0004] Further, in a mobile station, upon demodulation of a received signal, a process called rake combining is performed in order to reduce the effect of multipath and obtain a path diversity effect. In this rake synthesis, the data of the paths (candidate paths) used in the rake synthesis and the circuits of a plurality of systems (fingers) for performing the correlation operation of each multipath are described. A path management table (or simply a path table) to be managed is prepared (for example, see Patent Document 1). Then, each observed path is assigned to each finger based on the noss management table, and rake combining is performed.

[0005] The above-described path management table has path phase information, path correlation value information, threshold comparison information, rank information, forward protection / rearward protection information, and the like for each detected path. Data 'table. Further, the path phase information is information on a phase in which the profile result is also a path candidate. The path correlation value information is information on a correlation value that is a path candidate from the profile result. The threshold comparison information is information that indicates whether or not a predetermined threshold is compared with a path correlation value and exceeds a predetermined threshold. The rank information is the priority to be assigned to fingers, such as rank A (candidate to assign to the first priority finger) if it exceeds a certain threshold 1, and rank B (candidate to assign second priority finger) if it exceeds a certain threshold 2. Information that indicates Forward protection Z Backward protection information indicates forward protection and backward protection in rank state transition.

Patent document 1: Japanese Patent Application Laid-Open No. 2001-244859

Disclosure of the invention

Problems to be solved by the invention

[0006] However, the conventional mobile station device uses one channel path management table even when receiving a demodulation channel signal. As a result, if various parameters (threshold value, number of forward protection steps, number of backward protection steps, etc.) set in the path management table are optimized for DPCH reception, that is, for continuous signal reception, a burst signal There is a problem that the demodulation performance is degraded with respect to CQI information generation and HSDPA-related channel reception performed by receiving a signal.

[0007] Further, when a mobile station is in a soft handover (SHO) state, DPCH is transmitted from a plurality of cells to the mobile station. On the other hand, HS-PDSCH / HS-SCCH is transmitted from only one cell that is not subject to SHO. Therefore, in high-speed communication, a phenomenon occurs in which channels related to DPCH and HSDPA require a different number of fingers, even though they are received in the same cell. That is, the number of fingers for DPCH and the number of fingers for HS-PDSCH / HS-SCCH / CQI differ. Therefore Using a single path management table for channels with different numbers of fingers

As a result, the demodulation performance of the mobile station device deteriorates.

[0008] An object of the present invention is to provide a radio receiving apparatus capable of improving demodulation performance in a communication system such as HSDPA in which a receiving side receives signals of a plurality of channels having different characteristics, and a rake in this apparatus. The purpose is to provide a finger assignment method used when performing synthesis.

Means for solving the problem

Downlink HS—PDSCH is a channel for communicating non-continuous signals called communication packets. Since signals are transmitted in bursts, the receiving side receives instantaneous transmission path information when receiving the signals. It is necessary to demodulate based on The same is true for HS-SCCH. Also, the CQI information used for the HS PDSCH is information that determines the modulation scheme, coding scheme, bit rate, etc. used for the HS-PDSCH, and is required to be generated based on the instantaneous downlink quality. Can be

[0010] On the other hand, in the reception of the downlink DPCH, since the signal is continuously received, the received signal may be demodulated based on the propagation path state averaged over time.

[0011] However, the conventional mobile station apparatus, as described above, uses a single path table to receive a signal on a reception path using a different path for instantaneous channel information or average channel information. The management of

The present inventor pays attention to this point, and creates a separate finger assignment path table for HS-PDS CHZHS-SCCHZCQI generation and for DPCH in a communication system of the HSDPA scheme, and uses these tables. The present invention has been found that it is possible to improve the demodulation performance of the mobile station apparatus by independently performing finger assignment for each channel. Needless to say, this feature is not limited to the HSDPA communication system.

[0013] The wireless receiving apparatus of the present invention is a receiving means for receiving wireless signals of a plurality of channels and a path table used for finger assignment in rake combining, which is separately set in accordance with the characteristics of each channel. A plurality of path tables, and demodulating means for performing rake combining by independently performing the finger assignment for each channel using the plurality of path tables and demodulating the received radio signal. It adopts the configuration to do. That is, When the radio receiving apparatus of the present invention receives radio signals of a plurality of channels and performs rake combining, a finger assignment path table is separately set according to the characteristics of each channel, and each channel is set using these tables. Perform finger assignment independently.

The invention's effect

According to the present invention, it is possible to improve the demodulation performance of a wireless receiving device in a communication system such as HSDPA in which a wireless receiving device receives signals of a plurality of channels. Brief Description of Drawings

FIG. 1 is a block diagram showing a main configuration of a mobile station apparatus according to Embodiment 1.

[Figure 2] Diagram explaining the principle of improving demodulation performance

FIG. 3 is a block diagram showing a main configuration of a mobile station apparatus according to Embodiment 2.

[Figure 4] Diagram explaining the principle of improving demodulation performance

FIG. 5 is a block diagram showing a main configuration of a mobile station apparatus according to Embodiment 3.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that

Here, a mobile station device in an HSDPA communication system will be described as an example of a wireless receiving device.

(Embodiment 1)

FIG. 1 is a block diagram showing a main configuration of a mobile station apparatus according to Embodiment 1 of the present invention.

The mobile station apparatus according to the present embodiment includes: reception antenna 101, radio reception section 102, correlation circuit 103, DPCH path table management section 104, DPCH finger allocation section 105, HS DPA path table management section 106, an HSDPA finger assignment unit 107, a DPCH circuit 110a, and an HSDPA circuit 110b.

The DPCH circuit 110a has a correlation circuit 11 la (11 la—11 la—m), a demodulation circuit 112a, and a decoding circuit 113a. The HSDPA circuit 110b has a correlation circuit 11 lb. (111 b—1—ll lb-n), a demodulation circuit 112b, and a decoding circuit 113b. The DPCH circuit 110a and the HSDPA circuit 110b basically have the same configuration! /, So the same numbers are given in the figure, and both are distinguished by the alphabetic characters a and b. [0020] Wireless receiving section 102 performs predetermined wireless processing such as AZD conversion on a signal received via receiving antenna 101. Correlation circuit 103 has a matched filter (MF) and a correlator, and creates a delay profile of a desired cell (a cell containing its own station!) From a received signal. At this time, the correlation circuit 103 obtains a delay profile corresponding to each channel by using a known signal assigned to each channel.

[0021] DPCH path table management section 104 generates the above-described path management table for allocating each finger to the received DPCH signal based on the delay profile obtained by correlation circuit 103. The DPCH finger assignment unit 105 assigns each finger to the DPCH multipath based on the path management table generated by the DPCH path table management unit 104, and assigns the assignment result to the correlation circuit 11 la in the DPCH circuit 110a. Output.

The HSDPA path table management unit 106 stores the above-described path management table for assigning each finger to the received HSDPA-related channel signal based on the delay profile obtained by the correlation circuit 103. Generate. The HSDPA finger allocating unit 107 allocates each finger to the multipath of the HS DPA-related channel based on the path management table generated by the HSDPA path table managing unit 106, and stores the allocation result in the HS DPA circuit 110b. Output to the correlation circuit 111b.

The correlation circuit 11 la in the DPCH circuit 110 a has fingers for processing the multipath, specifically, the correlation circuits 111 a — 111 a — m. Based on the notified allocation result, each finger is allocated to a maximum of m multipath received signals output from wireless receiving section 102, and correlation calculation of each signal is performed. The demodulation circuit 112a rake-combines the correlation result of the correlation circuit 11la, performs synchronous detection, and demodulates the received signal. The decoding circuit 113a decodes the demodulated signal obtained by the demodulation circuit 112a to obtain DPCH decoded data.

The HSDPA circuit 110b performs the same operation as the DPCH circuit 110a, and obtains decoded data of the HSDPA-related channel. The power correlation circuit 11lb is different in that it has n fingers.

Next, the principle that the demodulation performance is improved by the mobile station apparatus having the above configuration will be described. This will be described in detail.

[0026] For example, the DPCH path table management unit 104 sets the threshold value to a higher value and sets a larger number of forward protection stages in the DPCH path table, so that a path (signal) considered to be noise can be generated. Finger assignment is not performed, and finger assignment is performed such that a path that once exceeds a threshold is left as a finger, that is, assignment suitable for continuous signal reception. However, this assignment can be made regardless of the reception status of the HSDPA channel. This improves the demodulation performance of the mobile station device.

FIG. 2 is a diagram illustrating the principle of improving the demodulation performance in more detail.

[0028] As shown in this figure, since the propagation path environment (the fusing curve F11) usually fluctuates, a path (signal) whose reception level has exceeded the threshold value even once in the observation section is a long-term one. It can be expected that the path has a high time-averaged reception level. Therefore, as shown in this figure, assuming that the path search process P11 is activated once every 40 msec, the time interval from the start of the path search process P11 to the end (for example, 5 msec) Even if the reception level is low (for example, at time tl2), the reception level of this path is expected to increase (recover) during the remaining 35 msec until the next path search process P11 starts. Therefore, if the path with the higher reception level is used for despreading, the demodulation performance of the received signal is improved. In other words, in a powerful situation, it is desirable to set the number of forward protection steps to be large (see the section T12 where fingers can be allocated) rather than to set the number of front protection steps to be small (see section T11). Setting a large number of forward protection steps reduces the sensitivity, in other words, increases the resistance to fluctuations in the transmission path environment.

On the other hand, in the HSDPA path table, by setting a low threshold value and a small forward protection, instantaneous propagation path information can be estimated correctly, and finger assignment suitable for packet reception is performed. be able to.

As described above, according to the present embodiment, in the HSDPA communication system, the path table can be separately set in accordance with the characteristics of each channel, so that the mobile station apparatus can improve the demodulation performance. it can.

(Embodiment 2) FIG. 3 is a block diagram showing a main configuration of a mobile station apparatus according to Embodiment 2 of the present invention. This mobile station apparatus has the same basic configuration as the mobile station apparatus shown in FIG. 1, and the same components are denoted by the same reference numerals and description thereof will be omitted.

A feature of the present embodiment is that a DPCHZHSDPA path table creation control unit 201 is further provided.

[0033] The DPCHZHSDPA path table creation control unit 201 appropriately controls the correlation circuit 103 based on the HSDPA reception information (information on the presence or absence of transmission of an HSDPA-related channel) notified from the base station, Change the path search cycle and averaging count. Thereby, demodulation performance can be improved.

Next, the principle that the demodulation performance is improved by the mobile station apparatus having the above configuration will be described in detail with reference to FIG.

[0035] In the conventional mobile station apparatus, the update cycle of the path table is set to about 40 msec which is common to both the DPCH and the HSDPA communication system, from the viewpoint of the current consumption of the mobile station, the increase of the circuit scale, and the performance improvement. The cycle is set. By increasing the frequency of updating the path table (shortening the update cycle) in order to cope with the channel environment of the channel related to HSDPA, even for DPCH that does not originally require a significant update cycle, Since the frequency of updating is increased, there is a problem that power consumption increases significantly.

[0036] Therefore, the path management table of the HSDPA-related channel and the update cycle and averaging count of the DPCH path management table are independently controlled, and for example, the update cycle and averaging of the path search processing P21 on the DPCH side Without changing the number of times, only the update cycle and the number of times of averaging of the no-search processing P22 on the HSDPA side are shortened so that the instantaneous and instantaneous propagation path environment can be estimated for HSDPA-related channels. As a result, for DPCH, the finger assignment interval can be set to T21 using the channel information averaged over time, and for HSDPA, the finger assignment interval can be set using instantaneous channel information. Can be set to T22 (<T21), so that the demodulation performance of the mobile station apparatus can be improved as a whole. Also, by independently controlling both node management tables, HSDPA receives transmission signals from one cell and DPCH transmits transmission signals from multiple cells. In a situation where it is necessary to receive a radio signal, it is only necessary to increase the frequency of creating a delay profile of only one cell, and the frequency of creating a DPCH delay profile can be maintained as it is. Therefore, an increase in power consumption can be suppressed.

As described above, according to the present embodiment, by further providing DPCHZHSDPA path table creation control section 201 that can independently control the DPCH path table and the HSDPA path table, the propagation path environment of each channel , The path table for each channel can be changed independently, and the demodulation performance can be improved.

(Embodiment 3)

FIG. 5 is a block diagram showing a main configuration of a mobile station apparatus according to Embodiment 3 of the present invention. This mobile station apparatus has the same basic configuration as the mobile station apparatus shown in FIG. 1, and the same components are denoted by the same reference numerals and description thereof will be omitted.

The feature of the present embodiment is that it has two radio reception units 102a and 102b, and a DPCHZHS DPA path table creation control unit 301, and uses only two reception antennas 101a and 101b only for HSDPA-related channels. This is to perform diversity reception.

The DPCHZHSDPA path table creation control unit 301 controls the switch 302 and the correlation circuit 103 in addition to the function of adaptively controlling the period for performing a path search and the number of times of averaging described in the second embodiment. Has a function of selecting a received signal to be input to the.

HSDPA finger assignment section 107 outputs finger assignment information identifying the antenna to HSDPA correlation circuit 11 lb. The correlation circuit 11 lb performs a correlation process on the signal received by the two receiving antennas 1 Ola and 101 b and input via the wireless receiving units 102 a and 102 b based on the previous finger assignment information.

[0042] The DPCHZHSDPA path table creation control unit 301 controls the correlation circuit 103 to create a path management table for the reception signal strengths of both the reception antennas 101a and 101b at the time of creating the path management table for HSDP A. So that By this means, compared to the case where reception diversity is not performed, fading correlation is low and the number of path candidates increases, so that a path with a better state can be selected more instantaneously. Therefore, the demodulation performance of HSDP A can be further improved.

As described above, according to the present embodiment, only HSDPA-related channels Since the reception is performed, the fading correlation is low and the number of path candidates increases during rake combining, and the demodulation performance can be further improved. In addition, since the path search cycle and averaging count can be independently and adaptively controlled only for HSDPA without changing the path search cycle for channels other than HSDPA, In comparison, processing time can be reduced, and current consumption can be reduced.

[0044] Note that the method of finger assignment for diversity reception is not limited to the above, and a method of selecting a different antenna path as much as possible using the fact that fading or shadowing correlation between antennas is different is also considered. Can be

[0045] The radio receiving apparatus according to the present invention is not limited to the above-described Embodiments 13 to 13, and can be implemented with various modifications. For example, the above embodiments 13 can be implemented in appropriate combinations.

[0046] The radio receiving apparatus according to the present invention can be mounted on a communication terminal apparatus and a base station apparatus used in a communication system in which communication is performed using a plurality of channels. It is possible to provide a communication terminal device and a base station device having the following.

[0047] In the present specification, the power described for application to the HSDPA channel is not limited to this. The reception performance can be improved by a path search method such as DSCH, which is different from DPCH similarly to HSDPA, like HSDPA. The present invention can be applied to a channel having a possibility, whereby the same effect as described above can be obtained.

[0048] Here, the present invention can also be realized by force software described as an example of a case where the present invention is configured by hardware.

[0049] The present specification is based on Japanese Patent Application No. 2003-364485 filed on October 24, 2003. All of this content is included here.

Industrial applicability

[0050] The radio receiving apparatus according to the present invention has an effect of improving demodulation performance.

It can be applied to mobile stations and the like used in communication systems employing the High Speed Downlink Packet Access (High Speed Downlink Packet Access) method.

Claims

The scope of the claims

[1] receiving means for receiving wireless signals of a plurality of channels;

A path table used for finger assignment in rake synthesis, a plurality of path tables separately set in accordance with the characteristics of each channel;

And a demodulator for performing rake combining by independently performing the finger assignment for each channel using the plurality of path tables and demodulating the received radio signal.

[2] The plurality of path tables,

A channel used for demodulation with information about the instantaneous propagation path environment and a channel used for demodulation with information about the average propagation path environment are set separately.

The wireless receiving device according to claim 1.

[3] The plurality of path tables,

2. The radio receiving apparatus according to claim 1, wherein a channel for packet communication and a channel for packet communication are set separately.

[4] The plurality of path tables include:

Set separately for shared channels and individual channels,

The wireless receiving device according to claim 1.

[5] A mobile station device comprising the wireless receiving device according to claim 1,

The receiving means,

Receiving HS-PDSCH, HS-SCCH, and DPCH from the base station device;

The same path table is set for HS-PDSCH and HS-SCCH, and a different path table from the same path table is set for DPCH.

Mobile station device.

[6] The apparatus further comprises changing means for adaptively changing the contents of the plurality of path tables;

The base station apparatus receives information on the presence or absence of transmission of the HS-PDSCH and the HS-SCCH, The changing means includes:

Changing the contents of the plurality of path tables based on the information on the presence or absence of the transmission;

6. The mobile station device according to claim 5, wherein:

[7] The receiving means,

Diversity receiving HS-PDSCH and HS-SCCH,

6. The mobile station device according to claim 5, wherein:

[8] A finger assignment method used for rake combining in a wireless receiving device that receives wireless signals of a plurality of channels,

A finger assignment path table is separately set according to the characteristics of each channel, and the finger assignment is performed independently for each channel.

Finger assignment method.