CN101478327B - Method and system for transmitting data on uplink code channel - Google Patents
Method and system for transmitting data on uplink code channel Download PDFInfo
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- CN101478327B CN101478327B CN200810055934XA CN200810055934A CN101478327B CN 101478327 B CN101478327 B CN 101478327B CN 200810055934X A CN200810055934X A CN 200810055934XA CN 200810055934 A CN200810055934 A CN 200810055934A CN 101478327 B CN101478327 B CN 101478327B
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Abstract
The invention provides a method and a system for transmitting data on uplink code channels. The method comprises the steps as follows: a corresponding orthogonal code sequence is allocated to each uplink information of each user set; one of the orthogonal code sequences is set as a pilot frequency sequence for the user set; each user set adopts each orthogonal code sequence to send command content of corresponding uplink information correspondingly on one uplink code channel; and an intermediate code part with a burst format used for channel estimation is closed at the same time. The method and the system can increase the resource utilization ratio of the uplink code channels.
Description
Technical field
The present invention relates to the TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) field, relate in particular to a kind of method and system of transmitting data on uplink code channel.
Background technology
TD SDMA (TD-SCDMA, Time Division Synchronous CDMA) system is based on the 3-G (Generation Three mobile communication system) of time division duplex (TDD, Time Division Duplex) mode.Take 1.28Mcps TDD as example, wireless frame length of TD-SCDMA is 10ms, is divided into the subframe of two 5ms.The structure of these two subframes is identical.Fig. 1 is the structural representation of prior art TD-SCDMA subframe, and as shown in Figure 1, the TD-SCDMA subframe is divided into the conventional time slot that 7 length are 675 μ s (TS0～6) and 3 special time slots (DwPTS, GP and UpPTS).
Fig. 2 is the burst structure schematic diagram of the conventional time slot of prior art TD-SCDMA subframe; as shown in Figure 2, each burst structure comprise 2 length be the data symbol of 352 chips (chip) (Data Symbols) partly, 1 length be 144chip intermediate code (Midamble) part and 1 protection interval (GP) that length is 16chip.Wherein, the Midamble code is the pilot frequency sequence that carries out channel estimating, and high level is basic Midamble code of each cell allocation, and all users use respectively its one or more displacement series in the residential quarter.
Owing to after signal transmits amplitude fading and phase distortion can occur in wireless channel, thereby the base station by antenna reception behind the uplink signal of TD-SCDMA system, need to carry out channel estimating, and disturb to received signal elimination according to channel estimation results, thereby obtain the signal that the user sends.
In existing TDD system, a uplink code channel can only carry a user's data.This is because a basic Midamble code is adopted in a residential quarter, and a window of a corresponding Midamble code of uplink code channel.If make a plurality of users send data at the same uplink code channel, then each user's channel estimating can drop in the same window, causes the base station to separate each user's channel estimating.In addition, the data that each user sends are random, and the base station also can't be distinguished the data of each user on the same code channel.Yet for some uplink code channel, its data volume that need to send is very little, and each user takies respectively a uplink code channel and taken a lot of resources, causes resource utilization low.
Summary of the invention
The embodiment of the invention proposes a kind of method of transmitting data on uplink code channel, improves the resource utilization of uplink code channel.
The embodiment of the invention also proposes a kind of system of transmitting data on uplink code channel, improves the resource utilization of uplink code channel.
Technical solution of the present invention is achieved in that
A kind of method of transmitting data on uplink code channel comprises:
Distribute corresponding orthogonal code sequence for each upstream message of each subscriber equipment, one of them orthogonal code sequence is set to the pilot frequency sequence of described subscriber equipment;
Describedly distribute the step of corresponding orthogonal code sequence for the upstream message of subscriber equipment and comprise:
For length is the orthogonal code sequence that the upstream message of 1 bit is distributed a correspondence, the command content that this upstream message of the true form of described orthogonal code sequence and one's complement representation is different; The orthogonal code sequence of distributing a plurality of correspondences for length greater than the upstream message of 1 bit, a data bit in this upstream message of the true form of each orthogonal code sequence and one's complement representation;
Each subscriber equipment adopts orthogonal code sequence separately, and the corresponding command content that sends corresponding upstream message is closed the intermediate code part for the burst format of channel estimating simultaneously on a uplink code channel;
Described each subscriber equipment adopts orthogonal code sequence separately, and the corresponding step that sends the command content of corresponding upstream message comprises on a uplink code channel:
Identical identical time slot and the spreading code of physical channel distribution for two or more subscriber equipmenies in the residential quarter;
Described orthogonal code sequence is carried out respectively two-way phase-shift keying BPSK modulation, sequence after the modulation is superposeed, be adopted as spreading code that the physical channel of described subscriber equipment the distributes sequence after to described stack and carry out spread spectrum, the sequence after the described time slot that distributes for the physical channel of subscriber equipment, the data symbol that adopts burst format partly send spread spectrum.
A kind of system of transmitting data on uplink code channel comprises:
The orthogonal code sequence distributor is used to each upstream message of each subscriber equipment to distribute corresponding orthogonal code sequence, and one of them orthogonal code sequence is set to the pilot frequency sequence of described subscriber equipment;
Describedly distribute corresponding orthogonal code sequence for the upstream message of subscriber equipment and comprise, for length is the orthogonal code sequence that the upstream message of 1 bit is distributed a correspondence, the command content that this upstream message of the true form of described orthogonal code sequence and one's complement representation is different; The orthogonal code sequence of distributing a plurality of correspondences for length greater than the upstream message of 1 bit, a data bit in this upstream message of the true form of each orthogonal code sequence and one's complement representation;
Time slot and spreading code distributor are used to the identical physical channel of two or more subscriber equipmenies in the residential quarter to distribute identical time slot and spreading code;
Subscriber equipment, be used for described orthogonal code sequence is carried out respectively the BPSK modulation, sequence after the modulation is superposeed, the spreading code that is adopted as the physical channel distribution of described subscriber equipment carries out spread spectrum to the sequence that the sequence generation module generates, described be the time slot that the physical channel of subscriber equipment distributes, the data symbol of employing burst format partly sends the sequence behind the described spread spectrum module spread spectrum, closes simultaneously the intermediate code part for the burst format of channel estimating.
As seen, the method and system of the transmitting data on uplink code channel that the embodiment of the invention proposes, by distributing corresponding orthogonal code sequence for the upstream message of subscriber equipment, and with one of them pilot frequency sequence as this subscriber equipment, and the orthogonal code sequence that subscriber equipment is adopted as its distribution represents the upstream message that sends, send at uplink code channel, so that after the base station receives upstream message, the pilot frequency sequence that can be adopted as user equipment allocation carries out coherent detection and channel estimating, obtains the upstream message that subscriber equipment sends.Just because of the orthogonal code sequence that has been user equipment allocation and with one of them as pilot frequency sequence, so that a plurality of users can send message at same uplink code channel, improved the resource utilization of uplink code channel, and coherent detection and channel estimating can be carried out to the message of receiving in the base station, finally obtain the upstream message that each subscriber equipment sends in the residential quarter.
Description of drawings
Fig. 1 is the structural representation of prior art TD-SCDMA subframe;
Fig. 2 is the burst structure schematic diagram of the conventional time slot of prior art TD-SCDMA subframe;
Fig. 3 is the method flow diagram of embodiment of the invention transmitting data on uplink code channel;
Fig. 4 is the burst format structural representation that the embodiment of the invention adopts.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, referring to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
The embodiment of the invention proposes a kind of method of transmitting data on uplink code channel, and referring to Fig. 3, Fig. 3 is the method flow diagram of embodiment of the invention transmitting data on uplink code channel, comprising:
Step 301: distribute corresponding orthogonal code sequence for each upstream message of each subscriber equipment, one of them orthogonal code sequence is set to the pilot frequency sequence of described subscriber equipment;
Step 302: each subscriber equipment adopts orthogonal code sequence separately, and the corresponding command content that sends corresponding upstream message is closed the intermediate code part for the burst format of channel estimating simultaneously on a uplink code channel;
Said method can further include:
Step 303: the base station receives the upstream message of multi-user installation at a uplink code channel, adopts the pilot frequency sequence of each subscriber equipment that the upstream message of the multi-user installation of reception is carried out coherent detection, determines to send the subscriber equipment of upstream message; Adopt the pilot frequency sequence of the subscriber equipment of described transmission upstream message that the upstream message of the multi-user installation of reception is carried out channel estimating, obtain the command content in each subscriber equipment upstream message.
Below be used as the VoIP business in the 1.28Mcps TDD high-speed shared indication channel (HS-SICH) describe the realization flow of the embodiment of the invention in detail as example.(ACK)/non-affirmation (NACK) message (length is 1 bit) and through-put power control (TPC, Transmission Power Control) message (length is 1 bit) are confirmed in the upper carrying of HS-SICH.After subscriber equipment is correctly decoded high speed down sharing physical channel (HS-PDSCH), sends ACK message and TPC message, otherwise send NACK message and TPC message.Wherein the indication of TPC message is raised or downward modulation HS-PDSCH power.
Send the scene of message for above-mentioned HS-SICH, above-mentioned steps 301 can be specially: when wireless link, high level is 2 orthogonal code sequence of each user equipment allocation, and one is used for representing ACK/NACK message, former representation ACK message wherein, one's complement representation NACK message; Another orthogonal code sequence is used for representing TPC message, and its true form and radix-minus-one complement are respectively applied to represent adjusting power and lower adjusting power.Wherein, will represent the pilot frequency sequence of the orthogonal code sequence of ACK message as this subscriber equipment, and be used for carrying out channel estimating.The length of orthogonal code sequence equals the number of chips of Data Symbols divided by spreading factor, take spreading factor as 16 as example, and the length=704/16=44 of orthogonal code sequence.
Above-mentioned steps 302 can be specially:
Step 3021: when subscriber equipment needs feeding back ACK message, the orthogonal code sequence of expression ACK message is carried out the BPSK modulation, obtain length and be 44 symbol sebolic addressing; Perhaps, when subscriber equipment need feed back NACK message, the radix-minus-one complement of the orthogonal code sequence of expression ACK message is carried out the BPSK modulation, obtain length and be 44 symbol sebolic addressing.
Step 3022: when subscriber equipment need feed back TPC message, raise or true form or the radix-minus-one complement of the orthogonal code sequence of expression TPC message are selected in downward modulation according to power, it is carried out the BPSK modulation, obtain length and be 44 symbol sebolic addressing.
Step 3023: above-mentioned two symbol sebolic addressings are superposeed.
In above-mentioned steps 3021 and the step 3022, the length of ACK/NACK message and TPC message is 1 bit, can distribute respectively to these two message the orthogonal code sequence of a correspondence; When needs transmission length during greater than the message of 1 bit, still can adopt orthogonal code sequence, each orthogonal code sequence represents one of them data bit of this message, such as: transmit certain message, its length is 2 bits, then can be the orthogonal code sequence of 2 correspondences of this distribution of messages, represent respectively 2 data bits of this message.
In addition, transmitted in the present embodiment 2 message, thereby in step 3023, needed representing that 22 symbol sebolic addressings superpose; In other embodiments of the invention, subscriber equipment can also only transmit 1 message, and this situation namely need not the step that superposes.
Step 3024: the spreading code that is adopted as this user equipment allocation carries out spread spectrum (spreading factor is 16 in the present embodiment) to the symbol sebolic addressing (length is 44) after superposeing in the step 3023, (44 * 16=704) sequence is partly sending for the time slot of this user equipment allocation, Data Symbols that this sequence order is placed on burst structure to obtain length and be 704.Midamble part in the middle of 2 Data Symbols, subscriber equipment does not send any data.
As shown in Figure 4, Fig. 4 is the burst format structural representation that the embodiment of the invention adopts, and in the Midamble part, the embodiment of the invention is closed transmission, and other parts are identical with the prior art send mode.
A plurality of subscriber equipmenies in the residential quarter all adopt above-mentioned steps 3021～step 3024 to send message, because the time slot that a plurality of users adopt is identical with spreading code, and send simultaneously data, just can realize that a plurality of subscriber equipmenies send data at same uplink code channel simultaneously.And, because orthogonal code sequence corresponding to each subscriber equipment makes the base station can correctly decomposite the message that each subscriber equipment sends.
Above-mentioned steps 303 can be specially:
Step 3031: upstream message is received in the base station, and the spreading code that is adopted as user equipment allocation is separated spread spectrum to the signal that receives.
Step 3032: the orthogonal code sequence that adopts the expression ACK message distribute to certain subscriber equipment is carried out coherent detection to the sequence of separating behind the spread spectrum, judges whether the upstream message that this subscriber equipment sends.
Adopt identical method, coherent detection is carried out to the subscriber equipment that may send upstream message successively in the base station, thereby detects the subscriber equipment that all send upstream message.Here, the subscriber equipment that may send upstream message refers to: after the base station sends HS-PDSCH message to certain user's equipment, all receive that the subscriber equipment of HS-PDSCH message all might return ACK/NACK message and TPC message, therefore these subscriber equipmenies are called the subscriber equipment that may send upstream message.
Step 3033: to all subscriber equipmenies that sends upstream message, utilize successively the orthogonal code sequence of its expression ACK message to carry out channel estimating, and according to estimated result the data that receive are disturbed elimination.
Step 3034: all are sent the subscriber equipment of data, the orthogonal code sequence of utilizing successively the orthogonal code sequence of its expression ACK message and representing its TPC message is to disturbing the sequence after eliminating to carry out coherent detection in the step 3033, thereby obtains the data bit that subscriber equipment sends.Concrete mode is: for example, if detect the orthogonal code sequence that subscriber equipment 1 has sent expression ACK message, can learn that then this subscriber equipment 1 has returned ACK message; If detect the radix-minus-one complement that subscriber equipment 1 has sent the orthogonal code sequence of expression TPC message, can learn that then this subscriber equipment 1 has returned TPC message, and the lower adjusting power of indication.
The embodiment of the invention also proposes a kind of system of transmitting data on uplink code channel, comprising:
The orthogonal code sequence distributor is used to each upstream message of each subscriber equipment to distribute corresponding orthogonal code sequence, and one of them orthogonal code sequence is set to the pilot frequency sequence of described subscriber equipment;
Subscriber equipment, for the orthogonal code sequence that adopts described orthogonal code sequence distributor to distribute, the corresponding command content that sends corresponding upstream message is closed the intermediate code part for the burst format of channel estimating simultaneously on a uplink code channel.
Said system can further include:
The base station is used for the upstream message at a uplink code channel reception multi-user installation, adopts the pilot frequency sequence of each subscriber equipment that the upstream message of the multi-user installation of reception is carried out coherent detection, determines to send the subscriber equipment of upstream message; Adopt the pilot frequency sequence of the subscriber equipment that sends upstream message that the upstream message of the multi-user installation of reception is carried out channel estimating, obtain the command content in each subscriber equipment upstream message.
In the said system, the orthogonal code sequence distributor can be radio network controller (RNC, Radio Network Controller).
Said system may further include:
Time slot and spreading code distributor are used to the identical physical channel of two or more subscriber equipmenies in the residential quarter to distribute identical time slot and spreading code;
Subscriber equipment can comprise:
The sequence generation module is used for described orthogonal code sequence is carried out respectively the BPSK modulation, and the sequence after the modulation is superposeed;
Spread spectrum module, the spreading code that distributes for the physical channel that is adopted as described subscriber equipment carries out spread spectrum to the sequence that the sequence generation module generates;
Sending module, be used for described be the time slot that the physical channel of subscriber equipment distributes, the data symbol of employing burst format partly sends the sequence behind the described spread spectrum module spread spectrum.
Above-mentioned time slot and spreading code distributor can be RNC or base station.
In the said system, the base station can specifically comprise:
Separate spread spectrum module, for the spreading code that the physical channel that is adopted as described subscriber equipment distributes the upstream message of the multi-user installation of reception is separated spread spectrum;
The coherent detection module, the pilot frequency sequence that is used for adopting the residential quarter may send each subscriber equipment of upstream message carries out coherent detection to the sequence that described solution spread spectrum module obtains, and determines to send in the residential quarter subscriber equipment of upstream message;
Channel estimation module, the pilot frequency sequence that is used for the subscriber equipment of employing residential quarter transmission upstream message carries out channel estimating to the upstream message of the multi-user installation of reception, according to channel estimation results the upstream message of the multi-user installation of described reception is disturbed elimination;
The upstream message acquisition module, the orthogonal code sequence of the subscriber equipment that is used for adopting described residential quarter to send upstream message is obtained the command content in each subscriber equipment upstream message to disturbing the sequence after eliminating to carry out coherent detection.
As seen, the method and system that the embodiment of the invention proposes, by being the orthogonal code sequence corresponding to upstream message distribution of each subscriber equipment in the residential quarter, and with one of them pilot frequency sequence as this subscriber equipment, subscriber equipment adopts orthogonal code sequence to represent the upstream message of its transmission, sends at uplink code channel; So that after the base station receives upstream message, can adopt pilot frequency sequence to carry out coherent detection and channel estimating, and adopt orthogonal code sequence to decomposite the upstream message that subscriber equipment sends.Just because of the orthogonal code sequence that has been user equipment allocation and with one of them as pilot frequency sequence, so that a plurality of users can send message at same uplink code channel, improved the resource utilization of uplink code channel, and coherent detection and channel estimating can be carried out to the message of receiving in the base station, finally obtain the upstream message that each subscriber equipment sends in the residential quarter.
Claims (8)
1. the method for a transmitting data on uplink code channel is characterized in that, described method comprises:
Distribute corresponding orthogonal code sequence for each upstream message of each subscriber equipment, one of them orthogonal code sequence is set to the pilot frequency sequence of described subscriber equipment;
Describedly distribute the step of corresponding orthogonal code sequence for the upstream message of subscriber equipment and comprise:
For length is the orthogonal code sequence that the upstream message of 1 bit is distributed a correspondence, the command content that this upstream message of the true form of described orthogonal code sequence and one's complement representation is different; The orthogonal code sequence of distributing a plurality of correspondences for length greater than the upstream message of 1 bit, a data bit in this upstream message of the true form of each orthogonal code sequence and one's complement representation;
Each subscriber equipment adopts orthogonal code sequence separately, and the corresponding command content that sends corresponding upstream message is closed the intermediate code part for the burst format of channel estimating simultaneously on a uplink code channel;
Described each subscriber equipment adopts orthogonal code sequence separately, and the corresponding step that sends the command content of corresponding upstream message comprises on a uplink code channel:
Identical identical time slot and the spreading code of physical channel distribution for two or more subscriber equipmenies in the residential quarter;
Described orthogonal code sequence is carried out respectively two-way phase-shift keying BPSK modulation, sequence after the modulation is superposeed, be adopted as spreading code that the physical channel of described subscriber equipment the distributes sequence after to described stack and carry out spread spectrum, the sequence after the described time slot that distributes for the physical channel of subscriber equipment, the data symbol that adopts burst format partly send spread spectrum.
2. method according to claim 1 is characterized in that, described method further comprises:
The base station receives the upstream message of multi-user installation at a uplink code channel, adopt the pilot frequency sequence of each subscriber equipment that the upstream message of the multi-user installation of reception is carried out coherent detection, determines to send the subscriber equipment of upstream message; Adopt the pilot frequency sequence of the subscriber equipment of described transmission upstream message that the upstream message of the multi-user installation of reception is carried out channel estimating, obtain the command content in each subscriber equipment upstream message.
3. method according to claim 1 is characterized in that, the length of described orthogonal code sequence is that burst format data symbol number of chips partly is divided by spreading factor.
4. method according to claim 1 is characterized in that, the step that described base station adopts the pilot frequency sequence of each subscriber equipment that the upstream message of the multi-user installation of reception is carried out coherent detection comprises:
The base station is adopted as the spreading code of the physical channel distribution of described subscriber equipment the upstream message of the multi-user installation of reception is separated spread spectrum;
The sequence that the pilot frequency sequence that adopts each subscriber equipment that may send upstream message in the residential quarter obtains after to described solution spread spectrum is carried out coherent detection, determines to send in the residential quarter subscriber equipment of upstream message.
5. method according to claim 2, it is characterized in that, the pilot frequency sequence that described employing sends the subscriber equipment of upstream message carries out channel estimating to the upstream message of the multi-user installation of reception, and the step of obtaining the command content in each subscriber equipment upstream message comprises:
Adopt the pilot frequency sequence that sends the subscriber equipment of upstream message in the residential quarter that the upstream message of the multi-user installation of described reception is carried out channel estimating, according to channel estimation results the upstream message of the multi-user installation of described reception is disturbed elimination;
Adopt the orthogonal code sequence of the subscriber equipment that sends upstream message in the residential quarter to disturbing the sequence after eliminating to carry out coherent detection, obtain the command content in each subscriber equipment upstream message.
6. the system of a transmitting data on uplink code channel is characterized in that, described system comprises:
The orthogonal code sequence distributor is used to each upstream message of each subscriber equipment to distribute corresponding orthogonal code sequence, and one of them orthogonal code sequence is set to the pilot frequency sequence of described subscriber equipment;
Describedly distribute corresponding orthogonal code sequence for the upstream message of subscriber equipment and comprise, for length is the orthogonal code sequence that the upstream message of 1 bit is distributed a correspondence, the command content that this upstream message of the true form of described orthogonal code sequence and one's complement representation is different; The orthogonal code sequence of distributing a plurality of correspondences for length greater than the upstream message of 1 bit, a data bit in this upstream message of the true form of each orthogonal code sequence and one's complement representation;
Time slot and spreading code distributor are used to the identical physical channel of two or more subscriber equipmenies in the residential quarter to distribute identical time slot and spreading code;
Subscriber equipment, be used for described orthogonal code sequence is carried out respectively the BPSK modulation, sequence after the modulation is superposeed, the spreading code that is adopted as the physical channel distribution of described subscriber equipment carries out spread spectrum to the sequence that the sequence generation module generates, described be the time slot that the physical channel of subscriber equipment distributes, the data symbol of employing burst format partly sends the sequence behind the described spread spectrum module spread spectrum, closes simultaneously the intermediate code part for the burst format of channel estimating.
7. system according to claim 6 is characterized in that, described system further comprises:
The base station is used for the upstream message at a uplink code channel reception multi-user installation, adopts the pilot frequency sequence of each subscriber equipment that the upstream message of the multi-user installation of reception is carried out coherent detection, determines to send the subscriber equipment of upstream message; Adopt the pilot frequency sequence of the subscriber equipment that sends upstream message that the upstream message of the multi-user installation of reception is carried out channel estimating, obtain the command content in each subscriber equipment upstream message.
8. system according to claim 7 is characterized in that, described base station comprises:
Separate spread spectrum module, for the spreading code that the physical channel that is adopted as described subscriber equipment distributes the upstream message of the multi-user installation of reception is separated spread spectrum;
The coherent detection module, the pilot frequency sequence that is used for adopting the residential quarter may send each subscriber equipment of upstream message carries out coherent detection to the sequence that described solution spread spectrum module obtains, and determines to send in the residential quarter subscriber equipment of upstream message;
Channel estimation module, the pilot frequency sequence that is used for the subscriber equipment of employing residential quarter transmission upstream message carries out channel estimating to the upstream message of the multi-user installation of reception, according to channel estimation results the upstream message of the multi-user installation of described reception is disturbed elimination;
The upstream message acquisition module, the orthogonal code sequence of the subscriber equipment that is used for adopting described residential quarter to send upstream message is obtained the command content in each subscriber equipment upstream message to disturbing the sequence after eliminating to carry out coherent detection.
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| WO2003034641A1 (en) * | 2001-10-17 | 2003-04-24 | Qualcomm Incorporated | Selecting optimal transmit formats for transmissions over allocated time durations |
| CN1710846A (en) * | 2005-07-27 | 2005-12-21 | 北京邮电大学 | Customer group pilot-frequency distribution method for orthogonal FDMA system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2003034641A1 (en) * | 2001-10-17 | 2003-04-24 | Qualcomm Incorporated | Selecting optimal transmit formats for transmissions over allocated time durations |
| CN1710846A (en) * | 2005-07-27 | 2005-12-21 | 北京邮电大学 | Customer group pilot-frequency distribution method for orthogonal FDMA system |
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