CN101400019A - Transmission method and system for broadcast channel in full downlink sub-frame - Google Patents
Transmission method and system for broadcast channel in full downlink sub-frame Download PDFInfo
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- CN101400019A CN101400019A CNA2007101752477A CN200710175247A CN101400019A CN 101400019 A CN101400019 A CN 101400019A CN A2007101752477 A CNA2007101752477 A CN A2007101752477A CN 200710175247 A CN200710175247 A CN 200710175247A CN 101400019 A CN101400019 A CN 101400019A
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Abstract
The invention discloses a transmission method for broadcasting channel in all down subframe comprising: in transmission time interval TTI more than 20ms, loading main public control physical channel p-CCPCHs mapped by broadcasting channel BCH on code channel of special time slot of subframe and whose N spreading factors are 16 for transmission, in which 1<=N<=4. In addition, the invention also discloses a broadcasting channel transmission system in all-down subframe comprising a base station, for loading main public control physical channel p-CCPCHs mapped by broadcasting channel BCH on code channel of special time slot of subframe and whose N spreading factors are 16 for transmission in more than 20ms interval TTI, in which 1<=N<=4. The inventive technical scheme can load P-CCPCHs mapped by BCH at special time slot.
Description
Technical field
The present invention relates to the communication technology, relate in particular to a kind of transmission method and system of broadcasting channel in all down subframe.
Background technology
In communication system, the time is split into Transmission Time Interval (TTI) usually, and TTI is meant the time interval that the transport block set between medium access control (MAC) layer and the physical layer arrives.TTI is subdivided into radio frames again, and a TTI comprises one or more radio frames.
Inserting (TD-SCDMA) system with Time Division-Synchronous Code Division Multiple Access is example, in the TD-SCDMA system, the length of a radio frames is generally 10ms, and each radio frames is divided into two subframes, the length of each subframe is 5ms, subframe is divided into time slot again, and Fig. 1 shows the structural representation of a kind of subframe in the prior art.As shown in Figure 1, each subframe is divided into 7 conventional time slots (TS0～TS6) and 3 special time slots again, not only comprise ascending time slot but also comprise descending time slot in each time slot, for example, TS0 is specifically designed to descending, TS1 and is specifically designed to up in seven conventional time slots, the uplink and downlink of TS2 to TS6 can change, and also have in three special time slots to be specifically designed to up and to be specifically designed to descending time slot.
Broadcast channel in the Common transport channel (BCH) is a descending transmission channel, is used for the peculiar information of broadcast system and sub-district, and BCH is mapped to Primary Common Control Physical Channel (P-CCPCH1 and P-CCPCH2) in physical layer.In TD-SCDMA, the position of P-CCPCHs (time slot/sign indicating number) fixed, and promptly to be carried to the spreading factor of TS0 be two code channels of 16 to P-CCPCHs, and the net amount of BCH is 246 bits (bit) according to fixed block length, and TTI is fixed as 20ms.
Along with of the increasingly extensive application of realization points such as multimedia broadcast/multicast service (MBMS) to the multicast service of multiple spot, this multicast service that transmits datagram from a data source to a plurality of targets, owing to only be applied to descending, therefore when adopting the structure of wireless sub-frame shown in Figure 1 to carry out full downlink transfer, being specifically designed to up shared resources such as TS1 just can't use, cause the waste of resource, the availability of frequency spectrum is lower.For this reason, at this descending business, proposed a kind of complete descending wireless sub-frame structure, as shown in Figure 2, Fig. 2 shows the structural representation of another wireless sub-frame in the prior art.Among Fig. 2, each wireless sub-frame is made of seven conventional time slots and a special time slot, and all time slots all are used for descending.In this frame structure, for Radio Resource service efficiency of the control signaling that improves downlink business such as BCH and MBMS etc., consideration is carried to the P-CCPCHs that BCH shone upon on the special time slot in the full downlink sub-frame shown in Figure 2, but the length of this special time slot is less than the length of the original TS0 that shines upon of P-CCPCHs, how to be implemented in therefore that the carrying P-CCPCHs that BCH shone upon is present urgent problem on the special time slot.
Summary of the invention
In view of this, provide a kind of transmission method of broadcasting channel in all down subframe among the present invention on the one hand, a kind of transmission system of broadcasting channel in all down subframe is provided on the other hand.
The transmission method of broadcasting channel in all down subframe provided by the invention comprises:
In the Transmission Time Interval TTI greater than 20ms, N the spreading factor that the Primary Common Control Physical Channel P-CCPCHs of broadcast channel BCH mapping is carried on the subframe special time slot is to transmit on 16 the code channel, wherein, and 1≤N≤4.
Preferably, described TTI greater than 20ms is: the TTI of 40ms.
Preferably, described N is 2 or 3.
Wherein, described TTI greater than 20ms is: the TTI greater than 20ms that is configured and is notified by radio network controller (RNC);
Perhaps be: the TTI that system makes an appointment greater than 20ms.
The transmission system of broadcasting channel in all down subframe provided by the invention, comprise: the base station, be used at Transmission Time Interval TTI greater than 20ms, N the spreading factor that the Primary Common Control Physical Channel P-CCPCHs of broadcast channel BCH mapping is carried on the subframe special time slot is to transmit on 16 the code channel, wherein, 1≤N≤4.
In addition, this system can further comprise: radio network controller (RNC) is used for and will be notified to the base station for utilizing the subframe special time slot to transmit the TTI greater than 20ms that described BCH disposes.
From such scheme as can be seen, pass through in Transmission Time Interval TTI among the present invention greater than 20ms, N the spreading factor that the Primary Common Control Physical Channel P-CCPCHs of broadcast channel BCH mapping is carried on the subframe special time slot is to transmit on 16 the code channel, wherein, 1≤N≤4, thus realized the carrying P-CCPCHs that BCH shone upon on special time slot.
Description of drawings
Fig. 1 is the structural representation of a kind of wireless sub-frame in the prior art;
Fig. 2 is the structural representation of another wireless sub-frame in the prior art;
Fig. 3 is a kind of structural representation of TS0 in the subframe shown in Figure 1;
Fig. 4 is a kind of structural representation of special time slot in the subframe shown in Figure 2;
TTI was the transmission contrast schematic diagram of 20ms and 40ms when Fig. 5 was 40ms for dispatching cycle.
Embodiment
In the embodiment of the invention; a kind of structure of considering TS0 shown in Figure 1 as shown in Figure 3; pilot code (Midamble sign indicating number pilot frequency sequence in the middle of comprising; be labeled as " M " among the figure), be positioned at the data field (Data of intermediate code both sides; be labeled as " D " among the figure) and the protection that is positioned at the time slot end at interval (GP); wherein, the length of each data field is 352 chips, and the length of two data fields is 704 chips altogether.When two spreading factors that P-CCPCHs is carried on TS0 are on 16 the code channel and adopt QPSK to modulate, the data length that can transmit is: 704 (data field length 704 chips)/16 (spreading factor) * 2 (code channel number) * 2 (QPSK modulation bit number)=176 bits, then in the TTI of 20ms, can transmit 176 * (20/5)=704 bit.Therefore, for net amount is the BCH of 246 bits according to block length, when in the TTI of 20ms, transmitting, can carry out transmitting by 4 TS0 behind the modulating-coding, wherein, can carry out channel interleaving when carrying out modulating-coding, the method by upsetting ordering (permutation) is transformed into the mistake of burst with data through the continuous mistake of mobile channel, utilizes chnnel coding the error correcting capability of antiburst error to be guaranteed the reliable transmission of data again.
For the special time slot among Fig. 2, its length is less than the length of TS0 among Fig. 3, Fig. 4 shows a kind of structural representation of this special time slot, comprise the Cyclic Prefix (CP) that is positioned at front end, middle lead code (Premble sign indicating number pilot frequency sequence, be labeled as " P " among the figure) and terminal data field (Data is labeled as " D " among the figure).Wherein, the length of data field is generally 256 chips (can certainly be other length, but because the total length of this special time slot is generally 352 chips, so the data field total length of data field total length TS0 in Fig. 3).At this moment, if two spreading factors that P-CCPCHs still is carried on special time slot are on 16 the code channel and when adopting QPSK to modulate equally, the data length that can transmit is: 256 (data field length 256 chips)/16 (spreading factor) * 2 (code channel number) * 2 (QPSK modulation bit number)=64 bits, institute can data quantity transmitted on the TS0 much smaller than being carried on.At this moment, if still in the TTI of 20ms, the transmission net amount is the BCH of 246 bits according to block length, when then data block being carried out modulating-coding, because sufficient channel redundancy degree can't be provided, thus can't guarantee the reliable transmission of data.
In addition, also can consider under the situation that guarantees original reliable transmission, increase the code channel number of P-CCPCHs carrying, may need to be carried on 176 * 16 (spreading factor)/2 (QPSK modulation bit number)/256 (data field length 256 chips) ≈ 5 (code channel number) this moment, but in this case, certainly will seize the shared resource of other transfer of data.
Therefore the transmission method of the broadcasting channel in all down subframe in the embodiment of the invention is: in the TTI greater than 20ms, N the spreading factor that the P-CCPCHs of BCH mapping is carried on the subframe special time slot is to transmit on 16 the code channel.Wherein, by the TTI greater than 20ms is set, make the code channel number take relatively under the less situation, be implemented in the carrying of the P-CCPCHs that carries out the BCH mapping in the special time slot of full downlink sub-frame, wherein the value greater than the TTI of 20ms can be 40ms, and 80ms etc., and the value of N can adaptively be determined according to carrying out greater than the value of the TTI of 20ms, generally, 1≤N≤4.
Correspondingly, the transmission system of the broadcasting channel in all down subframe in the embodiment of the invention comprises: the base station, be used at Transmission Time Interval TTI greater than 20ms, N the spreading factor that the P-CCPCHs of BCH mapping is carried on the subframe special time slot is to transmit on 16 the code channel, wherein, 1≤N≤4.
Wherein, can be configured and be notified to the base station by radio network controller (RNC) greater than the TTI of 20ms, promptly RNC is used for and will be notified to the base station for utilizing the subframe special time slot transmission TTI greater than 20ms that BCH disposed.
Perhaps the TTI greater than 20ms can be made an appointment by system, when then BCH is carried in the base station on the special time slot of subframe shown in Figure 2, can carry according to the TTI length of making an appointment.
When BCH adopts turbo or convolutional encoding, in conjunction with deinterleaving method, the length that interweaves (on the time) is long more, the gain that interweaves that obtains is also just big more, therefore compare the TTI of 20ms, TTI greater than 20ms can provide the higher gain that interweaves, and this gain can transform into link gain, promptly can transmit with littler transmitting power and reaches identical link performance.The saving of transmitting power just means that system has obtained more link budget gain, with identical transmitting power emission, can reach bigger signal cover so.
Minimum dispatching cycle of considering the BCH data block in the embodiment of the invention is 4 radio frames, be 40ms, and the TTI that utilizes 20ms in each scheduling is when carrying out the BCH transmission, have the discontinuous transmission intercal of 20ms at least, though the instantaneous transmission speed of BCH is 246/20 ≈ 12kbps, the overall transmission rate in should dispatching cycle is less than 246/40 ≈ 6kbps, therefore preferably, the value that can choose in the embodiment of the invention greater than the TTI of 20ms is 40ms, and can not influence overall transmission rate.TTI was the transmission contrast schematic diagram of 20ms and 40ms when as shown in Figure 5, Fig. 5 was 40ms for dispatching cycle.
When TTI was 40ms, the value of N can be 2 or 3 etc.
For example, 2 spreading factors that P-CCPCHs is carried on the subframe special time slot are when transmitting on 16 the code channel, can transmit altogether in the TTI of 40ms: 64 * (40/5)=512 bit.At this moment, under the situation that guarantees certain gain that interweaves, take less code channel resource.
2 spreading factors that P-CCPCHs is carried on the subframe special time slot are when transmitting on 16 the code channel, and can transmit altogether in the TTI of 40ms: 64 * 3/2 * (40/5)=768 bit, can obtain the bigger gain that interweaves this moment.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is preferred embodiment of the present invention; be not to be used to limit protection scope of the present invention; within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1, a kind of transmission method of broadcasting channel in all down subframe is characterized in that, this method comprises:
In the Transmission Time Interval TTI greater than 20ms, N the spreading factor that the Primary Common Control Physical Channel P-CCPCHs of broadcast channel BCH mapping is carried on the subframe special time slot is to transmit on 16 the code channel, wherein, and 1≤N≤4.
2, the method for claim 1 is characterized in that, described TTI greater than 20ms is: the TTI of 40ms.
3, method as claimed in claim 2 is characterized in that, described N is 2 or 3.
As each described method in the claim 1 to 3, it is characterized in that 4, described TTI greater than 20ms is: the TTI that is configured and notifies by radio network controller (RNC) greater than 20ms;
Perhaps be: the TTI that system makes an appointment greater than 20ms.
5, a kind of transmission system of broadcasting channel in all down subframe is characterized in that, this system comprises:
The base station is used at the Transmission Time Interval TTI greater than 20ms, and N the spreading factor that the Primary Common Control Physical Channel P-CCPCHs of broadcast channel BCH mapping is carried on the subframe special time slot is to transmit on 16 the code channel, wherein, and 1≤N≤4.
6, system as claimed in claim 5 is characterized in that, this system further comprises: radio network controller (RNC) is used for and will be notified to the base station for utilizing the subframe special time slot to transmit the TTI greater than 20ms that described BCH disposes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710175247A CN100586232C (en) | 2007-09-27 | 2007-09-27 | Transmission method and system of broadcasting channel of all-downlink sub-frame |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710175247A CN100586232C (en) | 2007-09-27 | 2007-09-27 | Transmission method and system of broadcasting channel of all-downlink sub-frame |
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| CN101400019A true CN101400019A (en) | 2009-04-01 |
| CN100586232C CN100586232C (en) | 2010-01-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200710175247A Expired - Fee Related CN100586232C (en) | 2007-09-27 | 2007-09-27 | Transmission method and system of broadcasting channel of all-downlink sub-frame |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103313400A (en) * | 2012-03-14 | 2013-09-18 | 华为技术有限公司 | Signaling sending and receiving control method, network side equipment and user equipment (UE) |
| CN103379637A (en) * | 2012-04-26 | 2013-10-30 | 中兴通讯股份有限公司 | Downlink physical layer channel processing method and device |
-
2007
- 2007-09-27 CN CN200710175247A patent/CN100586232C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103313400A (en) * | 2012-03-14 | 2013-09-18 | 华为技术有限公司 | Signaling sending and receiving control method, network side equipment and user equipment (UE) |
| WO2013135184A1 (en) * | 2012-03-14 | 2013-09-19 | 华为技术有限公司 | Method, network side device, and user equipment for transmitting and receiving control signaling |
| CN103313400B (en) * | 2012-03-14 | 2016-03-02 | 华为技术有限公司 | The sending, receiving method of control signal, network equipment and subscriber equipment |
| CN103379637A (en) * | 2012-04-26 | 2013-10-30 | 中兴通讯股份有限公司 | Downlink physical layer channel processing method and device |
| CN103379637B (en) * | 2012-04-26 | 2017-08-11 | 深圳市中兴微电子技术有限公司 | Down physical layer channel processing method and device |
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| Publication number | Publication date |
|---|---|
| CN100586232C (en) | 2010-01-27 |
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