CN1819488B - Frequency-extending code-word distribution with frequency-extending factor combination limited in teme-division duplex system - Google Patents
Frequency-extending code-word distribution with frequency-extending factor combination limited in teme-division duplex system Download PDFInfo
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- CN1819488B CN1819488B CN2005100080134A CN200510008013A CN1819488B CN 1819488 B CN1819488 B CN 1819488B CN 2005100080134 A CN2005100080134 A CN 2005100080134A CN 200510008013 A CN200510008013 A CN 200510008013A CN 1819488 B CN1819488 B CN 1819488B
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Abstract
The method includes: the network side of system determines the assignation of spreading factor combination required to be limited and gives out list of indication of data transmitting rate; before transmitting request for transmitting data, the subscriber equipment gets the list of indication of data transmitting rate; the subscriber equipment transmits the request for transmitting data to the base station; the base station determines the available transmitting rate, spread spectrum word and coding efficiency to be allocated for the subscriber equipment in term of the resources of base station and channel condition of the subscriber equipment.
Description
Technical field
The present invention relates to the method that data traffic transmission strengthens in the tdd communication systems, particularly, the present invention relates to the limited code distribution method of spreading factor combination assignment that the transfer of data enhancing is relevant in a kind of tdd communication systems.
Background technology
Because wireless communication system is subjected to the influence of limited, mutual serious interference of frequency resource and fading channel, the spectrum efficiency that how to improve system is the emphasis of radio communication always.
In the downlink grouped data transmission, high speed downlink packet inserts (HSDPA) technology and has been proved to be effectively a kind of communication mode at present.The step of this method is as follows:
● the base station broadcast pilot signal provides subscriber equipment to carry out channel estimating;
● the result that subscriber equipment will be measured reports the base station;
● one or more users of data are determined to receive according to all users' channel situation operation dispatching in the base station in next transmission cycle;
● the base station notifies these users that need receive data to begin to receive, and also can notify the speed and other relevant informations that receive data in case of necessity;
● the user carries out processing after receiving data, and whether needs retransmit to feed back the base station according to the result who handles;
● the base station receives to retransmit to carry out when requiring and retransmits, otherwise finishes this data transfer.
From above-mentioned description, as can be seen, realize that said process need transmit some control signalings between subscriber equipment and base station, realize the fast dispatch and the control of data traffic transmission.Wherein, for the assignment that just includes the spread spectrum code word in the downlink signaling in the HSDPA technology of TDD system.Because can only adopt spreading factor in down channel is 1 or 16 spreading code, therefore in this technology, do not need the assignment spreading factor, and only need the initial spreading code sequence number of assignment and stop the spreading code sequence number to get final product, for spreading factor is 16 spreading code, and transmit initial spreading code sequence number and stop the spreading code sequence number needs 8 information bits altogether.
In addition, the at present ongoing Enhancement Technology that also has transmitting uplink data.Wherein the comparison carried out of the up enhancement techniques of FDD system early on the mode that realizes from its scheduling, mainly contains two kinds of schemes at present:
● the rate scheduling method of base station (Node B) control (also being two threshold scheme)
In this scheme, each subscriber equipment is in the initialization procedure of dedicated transmission channel, and base station controller (RNC) distributes a transmission format composite set (TransportFormat Combination Set is called for short TFCS) and two TFC threshold values for each subscriber equipment (UE).This TFCS has comprised multiple transmission rate.In two threshold values, one is the threshold value of UE, and another is the threshold value of Node B, and the threshold value of UE must not be greater than the threshold value of Node B.In communication process, UE can select transformat combination (TFC) with limitation in the given TFCS of RNC, that is to say that the TFC of selection must must not be greater than current UE threshold value.If the TFC that UE uses equals current UE threshold value, and UE thinks when also having a ability (as: current transmit power is much smaller than specified maximum transmission power) with higher rate transmission UE having the demand that improves transmission rate simultaneously, can improve the UE threshold value to Node B request, whether Node B allows UE to improve the threshold value of UE according to current noise situation decision.If allow UE to improve threshold value, the threshold value of UE can not surpass the threshold value of Node B.Concrete process is as follows:
Having the downlink signaling of physical layer to be called speed simultaneously replys (being called for short RG) and is specifically designed to the speed application of UE is replied.When the value of RG is " Up ", illustrate that Node B agrees that UE increases its UE threshold value.When UE proposes speed application (promptly sending RR=" Up "), and Node B illustrate that Node B disagrees with UE increase UE threshold value when not replying (promptly not sending RG).When the value of RG is " Down ", illustrate that Node B requires this UE to reduce its UE threshold value.
● the speed and the time scheduling method of base station (Node B) control
In this scheme, UE is before carrying out transfer of data, some information need be issued Node B to carry out the request of transfer of data, Node B is according to the information of receiving, calculate the quality of the wireless channel of UE, and, to whether allowing this UE to transmit, carry out transfer of data etc. with great speed and unify scheduling and arrange according to the situation of the request of current noise situation and other UE.Concrete process is as follows:
As can be seen, in order to realize up enhancing, will transmit the control signaling of some physical layers too from two kinds of above-mentioned up enhanced scheme, to realize fast dispatch, adaptive channel changes better.But for the FDD system, its up dependence scrambler is distinguished channel, does not therefore need the assignment of spread spectrum code word.
For the TDD system, different users distinguishes channel according to orthogonal variable spread spectrum (OVSF) sign indicating number, therefore will dispatch the speed of its transfer of data, inevitably needs the assignment of corresponding ovsf code.
From the implementation of prior art,,, therefore do not need the distribution of spread spectrum code word because the FDD system uplink is distinguished according to scrambler for the up enhancement techniques among the FDD.But for the TDD system, the user distinguishes according to ovsf code, therefore will dispatch the speed of its transmitting uplink data, except will providing the transformat assignment, also to provide operable spread spectrum code word, otherwise will cause the interference between the user to increase.Therefore the up enhancement techniques of FDD system to be incorporated in the TDD system, also need to introduce the assigning method of ovsf code.
HSDPA technology for TDD, though code distribution method is arranged, but because the difference of the spreading factor that the up-downgoing of TDD system can be adopted, promptly advancing down and adopting spreading factor is 1 or 16, therefore do not need the assignment of spreading factor, and the sequence number that only needs to provide the sequence number of initial spreading code and stop spreading code.But for up enhancing,, therefore to dispatch transmitting uplink data because the spreading factor that uplink can be adopted can be 1,2,4,8 and 16, except the sequence number of wanting assignment spread spectrum code word, the spreading factor of also wanting assignment to adopt.
Below the required signaling bit number of the spreading code assigning method of clearly indicating spreading factor and spreading code sequence number is analyzed, provided the ovsf code that the TDD system uplink can be used among Fig. 1.
According to Fig. 1, can provide and distribute 1 status number that code word is possible:
According to standard, it is that code word on from this code word to root code word path is not used by other users that subscriber equipment will use the prerequisite of a code word, and all subcodes of this code word are not used by other users.Therefore can provide and distribute 2 status numbers that code word is possible:
In addition according to standard, a UE can use 2 physical channels at most simultaneously for many yards transmission, like this status number of might spreading code being transported to be:
N＝N
1+N
2＝553＜2
10
Therefore for clear and definite code assignment, the signaling bit number that wants to comprise all possible code assignment state needs is 10.
Because the signaling bit number is many more, so required through-put power is big more, and the influence for descending other service transmission performance is also big more so.Therefore if realize the distribution of spread spectrum code word with the signaling of 10 bits, will obtain fast dispatch so and gain, will be cost with the performance of sacrificing a lot of downlink business.
Summary of the invention
The purpose of this invention is to provide a kind of tdd communication systems transfer of data that is used for and strengthen the relevant limited code distribution method of spreading factor combination assignment, be used for the enhancing of data traffic transmission.For achieving the above object, the limited spreading code word distribution of spreading factor combination assignment in a kind of tdd communication systems comprises step:
A. the grid end need to determine the spreading factor combination assignment of restriction, provides message transmission rate indication tabulation;
B. subscriber equipment obtained message transmission rate indication tabulation before sending data transfer request:
C. subscriber equipment sends data transfer request to the base station;
D. speed, the corresponding transmission rate that can adopt, operable spread spectrum code word that this subscriber equipment can send and the code efficiency that should distribute are determined according to the channel condition of existing resources situation and subscriber equipment in the base station;
E. the base station sends the sequence number of transmission rate indication and spread spectrum code word to subscriber equipment;
F. subscriber equipment is handled the scheduling assignation information and is determined operable transmission rate, spreading code and code efficiency;
G. subscriber equipment adopts determined transmission rate, spread spectrum name and code efficiency to send data to the base station.
The present invention realizes the assignment of spread spectrum code word with less signaling burden, strengthens required rate scheduling thereby adapt to transfer of data, and system resource can more effectively be utilized, and improves the throughput of sub-district.
Description of drawings
Fig. 1 is the ovsf code that the TDD system uplink can be used;
Fig. 2 is the corresponding scheduling process performing step of code distribution method of implicit spreading factor assignment.
Embodiment
The present invention has provided that transfer of data strengthens the relevant limited code distribution method of spreading factor combination assignment in a kind of TDD system, this method can lie in the assignment and the spreading factor combination assignment of code efficiency in the message transmission rate assignment, thereby the assignment with code efficiency has replaced the bigger spreading factor combination of some signaling burden demand, limited the bigger spreading factor combination assignment of signaling burden, transmission spread spectrum code word sequence number information needed bit number be can reduce like this, thereby the distribution and the rate scheduling of spread spectrum code word in the transfer of data enhancing realized with less signaling burden.
The basic principle of the code distribution method that the spreading factor combination assignment that the transfer of data enhancing is relevant among the present invention is limited is that the required information bit of spread spectrum code word sequence number assignment is relevant with the assignment of spreading factor combination, the spreading factor number of assignment is many more, spreading factor is big more, and the required information bit of corresponding spread spectrum code word sequence number is big more.And can adapt to the assignment of different data rates except the assignment of spread spectrum code word, the assignment of code efficiency equally also can adapt to different data rate assignments, therefore the assignment of code efficiency also can be lain among the assignment of message transmission rate, replace the more spreading factor combination assignment of some corresponding spread spectrum code word sequence number assignment information needed bit, like this can be under not changing to the adaptive prerequisite of data velocity allocating, make the bigger spreading factor combination assignment of assignation information bit number demand be subjected to certain restriction, thereby reduced the required signaling burden of spread spectrum code word assignment, reduced influence other business.
The present invention has provided a kind of data in mobile communication system transmission and has strengthened the relevant limited code distribution method of spreading factor combination assignment.In order to realize this method, in the present invention:
At first, provided the limited corresponding scheduling process performing step of code distribution method of spreading factor combination assignment;
Secondly, provided the transmission rate indication list content that subscriber equipment will obtain before sending data transfer request;
In addition, give content corresponding to the scheduling assignment information of the inventive method;
Below action of the present invention is described:
At first provided the corresponding scheduling process performing step of the code distribution method that provides among the present invention, as shown in Figure 2.
201, the signaling burden that the grid end can bear according to system and substitute the spreading factor combination assignment that performance that the spreading factor combination can reach need to determine restriction provides the message transmission rate indication and tabulates.Each indication in the transmission rate indication tabulation all can comprise transmission block size indication information and spreading factor combination instruction, that is to say, each transmission rate indication all corresponding the indication of a transmission block size and a spreading factor combination indicate.In this tabulation, will limit the bigger spreading factor combination assignment of some corresponding spread spectrum code word sequence number assignment information needed bit, that is to say the assignment that will can not have these spreading factor combinations in the tabulation.The performance decision that the spreading factor combination can reach be born and be substituted to these restrictions will according to the signaling that system can bear.After transmission rate indication tabulation has had above-mentioned restriction, just may have different transmission block size corresponding identical spreading factor combination assignment situation, the adaptation of channel bit in this case and transmission block size obtains depending on different coding efficiency appointments.These code efficiencies do not spell out in tabulation, but lie among message transmission rate assignment and the spreading factor combined information, that is to say to obtain according to transmission block size and spreading factor combination calculation;
202, subscriber equipment obtains message transmission rate indication tabulation.The mode that subscriber equipment obtains message transmission rate indication tabulation can be prior agreement, also can pass to subscriber equipment by high-level signaling, can also be with the form notifying user equipment of broadcasting;
203, subscriber equipment sends data transfer request to the base station;
204, the base station will be handled the data transfer request that subscriber equipment sends, channel condition according to existing resources situation and subscriber equipment, determine the speed that this subscriber equipment can send, the corresponding transmission rate that can adopt, operable spread spectrum code word and the code efficiency that should distribute;
205, to the sequence number of subscriber equipment transmission transmission rate indication and spread spectrum code word.Owing to comprised the information that transmission rate indicates pairing spreading factor to indicate in the transmission rate that subscriber equipment the is obtained indication tabulation in step 202, therefore in the scheduling assignment that sends to subscriber equipment, do not need the clear and definite assignment of spreading factor.Same owing to size and spreading factor combination assignment according to transmission block, can calculate required coding efficiency appointment, so also not need the clear and definite assignment of code efficiency.
206, subscriber equipment is handled the scheduling assignation information and is determined operable transmission rate, spreading code and code efficiency.The transmission rate indication tabulation that subscriber equipment obtains with reference to step 202, according to the definite operable spreading factor that is distributed of transmission rate indication of institute's assignment or the combination of spreading factor, and then, just can determine the spreading code of institute's assignment according to the spreading code sequence number of scheduling assignment.According to data block size and spreading factor combined information, can also calculate the code efficiency of institute's assignment in addition.
207, subscriber equipment adopts the determined transmission rate of step 206, spread spectrum code word and code efficiency to send data to the base station.
Secondly, provided the transmission rate indication list content that subscriber equipment will obtain among the present invention before sending data transfer request, as shown in table 1.
The message transmission rate instruction content that table 1 subscriber equipment need obtain in advance
| Message transmission rate indication sequence number | The transmission block size | Spreading factor combination indication |
| 0 | TBSI 0 | SFCI 0 |
| 1 | TBSI 1 | SFCI 1 |
| ... | ... | ... |
| N | TBSI N | SFCI N |
In the table, TBSI
iFor sequence number is the transmission block size indication of i, SFCI
iFor for sequence number being the spreading factor indication of i.It should be noted that, the use of the spreading factor combination assignment that some corresponding spread spectrum code word sequence number assignment information needed bit is bigger in the used transmission rate indication tabulation of the inventive method will be restricted, and substitute and use spreading factor combination assignment that can substitute or more approaching and that the information needed bit is less.The performance decision that the spreading factor combination can reach be born and be substituted to these restrictions will according to the signaling that system can bear.Like this, the combination indication of spreading factor and the size of transmission block are not one to one, and different transmission block sizes may have identical spreading factor combination assignment.On message transmission rate, channel bit depends on different code efficiencies with the adaptation of transmission block size and realizes.Code efficiency can calculate according to the size and the spreading factor combination assignation information of transmission block.
As can be seen from the above table, after subscriber equipment has obtained this tabulation, whenever obtain the indication of a message transmission rate, just can determine the indication of indication of corresponding transmission block size and spreading factor, add the indication of spreading code sequence number, just can determine the message transmission rate and the spread spectrum code word of being distributed.Simultaneously, according to the size and the spreading factor combination of transmission block, can also determine the code efficiency of being distributed.
In addition, the present invention gives the content corresponding to the scheduling assignment information of the inventive method, and its content mainly comprises:
● the transmission rate indication
The transmission block size that in this information, will indicate subscriber equipment to adopt, thus transmission rate can be obtained, and implicit operable spreading factor combination of subscriber equipment and the coding efficiency appointment of indicating.
● the sequence number indication of spread spectrum code word
In this information, will provide the sequence number of spread spectrum code word,, determine the spreading code that is distributed to be implied the spreading factor indication of indication in conjunction with the transmission rate indication.
● other
Other some scheduling assignment information.
It should be noted that in the content of schedule information of the present invention not have explicit spreading factor indication information, therefore correspondingly also saved the information bit of transmission spreading factor indication.In addition, assignment and spreading factor combination assignment by the transmission block size can also calculate the assignment of code efficiency, thereby adapt to the variation of different transmission block sizes under the same spread combinations of factors.
Embodiment
The present invention has provided that transfer of data strengthens the relevant limited code distribution method of spreading factor combination assignment in a kind of TDD system, is used for the enhancing of data traffic transmission.For the ease of understanding the present invention, provided the embodiment of the spreading code word distribution of the implicit spreading factor assignment that is used for up enhancing in the LCR TDD system below.
At first, the downlink signaling information bit that can allow according to the code word assignment can be determined spreading factor combination assignment list.Utilize the inventive method, spreading factor combination assignment can lie in transmission in the message transmission rate indication, so the required information bit of spread spectrum code assignment only is that spread spectrum code word sequence number is distributed required bit number.Because spreading factor is big more, the number of spreading code is many more, and the information bit that so required code word sequence number is distributed is many more, and therefore under given information bit restriction, the assignment of some spreading factor combination can not be used.
Based on the consideration of efficient, 2 code words with same spread factor can be replaced by his father's code word in addition, and required like this signaling bit can reduce greatly, therefore will not have the combination assignment of two identical spreading factors in the code word combination assignment.
Can be given in the different information bit restrictions that is used for the spread spectrum code assignment down, available spreading factor and spreading factor combination assignment, as shown in table 2.
Available down spreading factor and the spreading factor combination assignment of code assignment information bit number restriction that table 2 is different
Annotate: " √ " represents that this spreading factor assignment or spreading factor make up assignment and can use, and " * " represents that it is unavailable.
The second, during indicating to subscriber equipment transmission transmission rate, the base station except will sending the transmission block size, also to be implied with the information of spreading factor combination assignment and the assignation information of code efficiency.Because based on different code efficiencies, different data rate transport can be used identical spreading factor combination, so the bigger spreading factor combination assignment of signaling burden can be substituted by the less spreading factor combination assignment of those signaling burdens.Providing some examples below describes:
For many yards transmission, a subscriber equipment can use 2 physical channels at most simultaneously up, suppose that power control ratio is specially for 2, the simultaneous bias bit is 2, so according to the ascending time slot form of LCR TDD, can provide not limited spreading factor combination indication and limited spreading factor and make up transmission rate indication collection example under the indication situation, as shown in table 3.
The transmission rate indication collection example that LCR TDD system is possible under the limited and not limited situation of table 3 spreading factor combination
As can be seen from the above table, realize the data rate assignment, the spreading factor combination assignment that the signaling burden is bigger can be born less spreading factor combination indication with signaling and be replaced in conjunction with different coding efficiency appointments, the corresponding so required signaling burden of spread spectrum code assignment that also just reduced.
Therefore after subscriber equipment has obtained the limited corresponding transmission rate indication of spreading factor combination assignment tabulation, after the transmission rate assignment of having received base station assigned, just can know corresponding transmission block size assignment and spreading factor combination assignment, and can calculate code efficiency.When therefore the user equipment allocation spreading code was given in the base station, the sequence number that only needs to send the spread spectrum code word to subscriber equipment got final product.
Utilize the limited code distribution method of spreading factor combination assignment proposed by the invention, will not have the bigger spread spectrum code word sequence number assignment of signaling burden, so the required signaling burden of spread spectrum code assignment will significantly reduce.In order to compare, in table 4, provided the limited and spreading factor combination assignment of spreading factor combination assignment not under the limited approach, the information bit that the spread spectrum code assignment is required.In spreading factor combination assignment limited approach, the required downlink signaling bit number of spread spectrum code assignment is restricted to 4.
The downlink signaling information bit that table 4 spread spectrum code word combination assignment limited approach and constraint-free approach are required
From table 2, the limited method of the spread spectrum code word combination assignment that is proposed as can be seen in table 3 and the table 4 can be under the prerequisite that does not influence velocity allocating, significantly reduce the required downlink signaling information bit of spread spectrum code assignment, the downlink signaling burden has obtained tangible reduction.
Claims (5)
1. the limited spreading code word distribution of spreading factor combination assignment in the tdd communication systems comprises step:
(a) the grid end need to determine the spreading factor combination assignment of restriction, provides message transmission rate indication tabulation, and described message transmission rate indication tabulation comprises the corresponding relation between message transmission rate and spreading factor combination and the code efficiency;
(b) subscriber equipment obtained described message transmission rate indication tabulation before sending data transfer request;
(c) subscriber equipment sends data transfer request to the base station;
(d) the operable message transmission rate of this subscriber equipment, the corresponding transformat that can adopt, operable spread spectrum code word and the code efficiency that should distribute are determined according to the channel condition of existing resources situation and subscriber equipment in the base station;
(e) base station sends the sequence number of message transmission rate indication and spread spectrum code word to subscriber equipment;
(f) subscriber equipment is determined transmission rate, spread spectrum code word and the code efficiency of institute's assignment according to message transmission rate indication tabulation and the message transmission rate indication that receives and the sequence number of spread spectrum code word;
(g) subscriber equipment adopts determined transmission rate, spread spectrum code word and code efficiency to send data to the base station;
Wherein, in step (f), message transmission rate indication in the described message transmission rate indication of the subscriber equipment foundation tabulation comes the definite operable spreading factor that is distributed or the combination of spreading factor, then according to the sequence number of the spread spectrum code word that receives, determines the spread spectrum code word of institute's assignment.
2. according to the described method of claim 1, it is characterized in that: in conjunction with the assignment of spread spectrum code word and the assignment of code efficiency the channel bit that is provided is adjusted, to adapt to the rate scheduling demand of variation.
3. method according to claim 1 is characterized in that: in step (a), each indication in the described message transmission rate indication tabulation comprises transmission block size indication information, spreading factor combination instruction and coding efficiency appointment information.
4. method according to claim 1 is characterized in that: in step (a), the form notifying user equipment of subscriber equipment or broadcasting is passed in described message transmission rate indication tabulation with prior agreement, by high-level signaling.
5. method according to claim 4 is characterized in that described step (f) also comprises: according to transmission block size and spreading factor combined information, calculate the code efficiency of institute's assignment.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1387707A (en) * | 1999-11-03 | 2002-12-25 | 艾利森公司 | Methods and apparatus for allocating resources in hybrid TDMA communications systems |
| WO2003052985A1 (en) * | 2001-12-18 | 2003-06-26 | Telecom Italia S.P.A. | Method for code re-allocation in telecommunication systems, related system and computer product |
| CN1460329A (en) * | 2001-03-30 | 2003-12-03 | 皇家菲利浦电子有限公司 | Methods and devices for converting as well as decoding stream of data bits, signal and record carrier |
| JP2003348050A (en) * | 2003-06-09 | 2003-12-05 | Victor Co Of Japan Ltd | Spread spectrum communication system |
| CN1819487A (en) * | 2005-02-07 | 2006-08-16 | 北京三星通信技术研究有限公司 | Frequency-extending code-word distribution containing frequency-extending factor in time-division duplex system |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1387707A (en) * | 1999-11-03 | 2002-12-25 | 艾利森公司 | Methods and apparatus for allocating resources in hybrid TDMA communications systems |
| CN1460329A (en) * | 2001-03-30 | 2003-12-03 | 皇家菲利浦电子有限公司 | Methods and devices for converting as well as decoding stream of data bits, signal and record carrier |
| WO2003052985A1 (en) * | 2001-12-18 | 2003-06-26 | Telecom Italia S.P.A. | Method for code re-allocation in telecommunication systems, related system and computer product |
| JP2003348050A (en) * | 2003-06-09 | 2003-12-05 | Victor Co Of Japan Ltd | Spread spectrum communication system |
| CN1819487A (en) * | 2005-02-07 | 2006-08-16 | 北京三星通信技术研究有限公司 | Frequency-extending code-word distribution containing frequency-extending factor in time-division duplex system |
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