CN101959240A - Relay link-physical broadcast channel (R-PBCH) mapping and transmitting method and device - Google Patents
Relay link-physical broadcast channel (R-PBCH) mapping and transmitting method and device Download PDFInfo
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- CN101959240A CN101959240A CN2009100882720A CN200910088272A CN101959240A CN 101959240 A CN101959240 A CN 101959240A CN 2009100882720 A CN2009100882720 A CN 2009100882720A CN 200910088272 A CN200910088272 A CN 200910088272A CN 101959240 A CN101959240 A CN 101959240A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0037—Inter-user or inter-terminal allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations
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Abstract
The invention discloses a relay link-physical broadcast channel (R-PBCH) mapping and transmitting method and an R-PBCH mapping and transmitting device for solving the mapping problem from a base station to a node R-PBCH in the prior art. The method comprises the steps of generation of information bit, constellation modulation, multi-antenna processing, mapping in the frequency direction and mapping in the time direction. The information bit, the modulation mode and the mapping position of the R-PBCH in the frequency direction can be the same as or different from those of the base station-to-terminal link-physical broadcast channel; and the mapping of the R-PBCH in the time direction comprises mapping on wireless frames, sub frames and OFDM (orthogonal frequency division multiplexing) symbols. The method and the device can be well applied to the base station-to-relay node link, have simple mapping modes, ensure backward compatibility, solve the problem that a relay node can accurately receive the PBCH transmitted by the base station, and meanwhile ensure low overhead.
Description
Technical field
The present invention relates to wireless communication technology, relate in particular to medium-term and long-term evolution system (the Long TermEvolution of 3GPP, LTE), senior long evolving system (Long Term Evolution Advanced, LTE-A) Physical Broadcast Channel (Relay link-Physical Broadcast Channel, R-PBCH) mapping and method for transmitting and the device of repeated link in.
Background technology
LTE system, LTE-A system, IMT-Advanced (International MobileTelecommunication Advanced, senior international mobile communication system) all be with OFDM (Orthogonal Frequency Division Multiplexing, OFDM) technology is the basis, mainly the data mode of time-frequency bidimensional in ofdm system, Fig. 2 is a wireless frame structure decomposing schematic representation in the present LTE system, a radio frames is made up of 10 wireless sub-frames, and each subframe is made up of a plurality of OFDM symbols.Fig. 3 is Resource Block and a subcarrier schematic diagram in LTE, the LTE-A system, (the Resource Block of RB in LTE, LTE-A, Resource Block) be defined as the OFDM symbol in continuous 1 slot (time slot) on time-domain, continuous 12 or 24 subcarriers on frequency domain, so 1 RB by
Individual RE (Resource Element, Resource Unit), wherein N
SymbThe number of representing the OFDM symbol in 1 slot,
The number of expression Resource Block continuous subcarrier on frequency domain.
Logic channel BCCH (Broadcast Control Channel in the present LTE system, Broadcast Control Channel) is divided into MIB (Master Information Block, abbreviate Master Information Block or information bit as) and SIB (System Information Block, system information block), wherein MIB is mapped to transmission channel BCH (Broadcast Channel, broadcast channel) on, SIB is mapped on the transmission channel DL-SCH (Downlink-Shared Channel, DSCH Downlink Shared Channel); Transmission channel BCH is mapped on the PBCH (Physical Broadcast Channel, Physical Broadcast Channel), and transmission channel DL-SCH is mapped on the PDSCH (Physical Downlink Shared Channel, Physical Downlink Shared Channel).
The mib information territory comprises 24bits information, order is followed successively by downlink bandwidth (dl-Bandwidth), Physical HARQ Indicator Channel configuration information (Physical Hybrid Automatic Repeat Request Indicator Channel, phich-Config), System Frame Number (systemFrameNumber), reserve (spare) bit, concrete every kind of information comprises: dl-Bandwidth (3bits), phich-Config (3bits:1bit phich-Duration and 2bits phich-Resource), systemFrameNumber (8bits), spare (10bits).Bit number to be encoded equals 40bits, and promptly the information bit of 24bits adds the check digit of 16bits, because terminal was not also known concrete antenna configurations before demodulation PBCH, so the check digit of 16bits need be carried out scrambling according to the antenna configurations of eNode-B.Bit-order to be encoded is carried out tail-biting convolutional code, QPSK modulation, many antenna processing, resource mapping.
The scrambling of table 1.CRC check digit
Table 2.PBCH mapping
The goal in research of B3G/4G is to compile connecting systems such as honeycomb, fixed wireless access, nomadic, radio area network, in conjunction with complete IP network, being respectively the user under high speed and low speed mobile environment provides peak rate to reach the wireless transmission capability of 100Mbps and 1Gbps, and realize the seamless connection of cellular system, regional wireless network, broadcasting, telstar communication, make human realize " anyone realizes communicating by letter of any way with all other men at any time and any place ".The Relay technology can be used as effective measures and should use, and the covering that the Relay technology both can increase the sub-district also can increase cell capacity.
Fig. 1 is for introducing the system configuration schematic diagram of via node, increased new link after introducing relay in the system, corresponding term comprises: the link between eNode-B (being called for short eNB) and the relay is called the link that the link between backhaullink (back haul link), relay and the UE (User Equipment, subscriber equipment) is called between access link (access link), eNode-B and the UE and is called direct link (link direct transfers).
In adopting band during relaying inband-relay, promptly eNode-B to relay link and relay to the UE link operation on identical frequency resource.Because the relay launching opportunity produces interference (self-interference) to the receiver of oneself in the band, so eNode-B on identical frequency resource is impossible with relay simultaneously to the UE link to the relay link, unless enough Signal Separation and isolation between antennas are arranged.Similar, relay also can not launch to eNode-B when receiving the data that UE launched again.
According to the regulation in the present LTE system, 1 10ms radio frames frame is made of the subframe subframe of 10 1ms, can comprise clean culture Unicast and multicast and broadcast Multicast Broadcast, wherein when FDD (Frequency Division Duplex) mode, #0, the #5 subframe is as the emission synchronizing signal, and #4, the #9 subframe is as paging paging, when TDD (Time Division Duplex) mode, #0, the #5 subframe is as the emission synchronizing signal, and #1, the #6 subframe is as paging paging, that is to say for FDD{#0, #4, #5, the #9} subframe, TDD{#0, #1, #5, the #6} subframe has above-mentioned special purpose, so can not be used for the distribution of Multicast Broadcast Single Frequency Network MBSFN subframe (Multicast BroadcastSingle Frequency Network), promptly assignable MBSFNsubframe mostly is 6 subframe subframe most in 1 radio frames frame.
The solution of a possible transmitting-receiving interference problem is to make relay when the data that receive from eNode-B, do not carry out firing operation to UE, that is to say at relay and behind the UE link, need to increase gap " gap ", be used for backhaul subframe by configuration MBSFN subframe, make UE in " gap " time range, not carry out any reception/firing operation, and Relay finishes the switching that is transmitted into reception in " gap " time range, switches after finishing in the data of the OFDM of back symbol reception from eNB.In LTE, adopt MBSFN subframe to be used for backhaul subframe at present, its concrete mode is: multimedia controlled entity MCE (MBMS Control Entity) is at first to the available MBSFNsubframe of eNode-B configuration, and eNode-B is the available backhaulsubframe of configuration in these available MBSFN subframe again.Therefore, the UE emission control information (the feedback information ACK/NACK (Acknowlegment/Negative Acknowlegment) and the uplink authorization information UL grant that comprise up emission data) that relay at first gives its subordinate at preceding 1 or 2 OFDM symbol when descending.
According to the regulation in the present LTE system, FDD{#0, #4, #5, #9} subframe, TDD{#0, #1, #5, #6} subframe have above-mentioned special purpose, so can not be used for the distribution of Multicast Broadcast Single Frequency Network MBSFN subframe, and PBCH launches at #0subframe, and #0subframe can not be as backhaul subframe, and this causes the relay that is in operating state can't normally receive the PBCH that eNode-B issues.
At present, is a focus for MBSFN subframe as the research of backhaul subframe, (Relay Node: via node/relay station) mapping of the concrete Physical Broadcast Channel of link and radiation pattern remain blank, and this this invention problem that will solve just but eNode-B (base station) is to RN.Receiving terminal (via node, user terminal) after synchronously or at regular intervals need obtain broadcast message and just can carry out follow-up normal work.At present in LTE, but each subframe that comprises PBCH is self-demarking code, that is to say the enough good words of hypothesis channel quality, terminal can just can demodulate PBCH by arbitrary reception in 4 times, for backhaul link, channel quality is extraordinary, so PBCH there is no need to launch repeatedly in the repetition period, only emission once gets final product, can certainly launch repeatedly, the present invention is referred to as R-PBCH (Relaylink-Physical Broadcast Channel, the Physical Broadcast Channel of repeated link) with the base station to the Physical Broadcast Channel between the via node.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of Physical Broadcast Channel mapping and launching technique of repeated link, is used for solving the mapping problems of prior art base station to the PBCH of via node link,
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of Physical Broadcast Channel mapping and launching technique of repeated link comprise step:
Generate the information bit of base station to the Physical Broadcast Channel R-PBCH of via node link;
Information bit is carried out chnnel coding, constellation modulation, many antenna processing;
Determine described R-PBCH in mapping position on the frequency direction and mapping position on time orientation, concrete R-PBCH shines upon the subframe that is included in the radio frames and the mapping on the orthogonal frequency division multiplex OFDM symbol on time orientation;
The base station is transmitted to via node at back haul link with it after the mapping of finishing described R-PBCH.
Further, the mapping of described R-PBCH on subframe satisfies condition: R-PBCH-SF ∈ { RF|SFN mod n=0}, the subframe that is the R-PBCH mapping belongs to the radio frames that R-PBCH shines upon, wherein R-PBCH-SF represents the subframe at R-PBCH place, RF represents the radio frames at R-PBCH place, SFN represents System Frame Number, and n represents the wireless frame period of R-PBCH mapping, and n is a positive integer; Mod represents to get surplus;
In the wireless frame period of R-PBCH mapping, in 1 back haul link subframe backhaul subframe or a plurality of back haul link subframe, carry R-PBCH.
Further, the mapping of described R-PBCH on the orthogonal frequency division multiplex OFDM symbol is meant:
Preceding 4 of No. 1 time slot of the subframe that comprises the R-PBCH place, or preceding 3, or preceding 2, or preceding 1 OFDM symbols carry R-PBCH; Or;
At the second-to-last of No. 0 time slot of the subframe that comprises the R-PBCH place, or the reciprocal the 2nd to the 3rd reciprocal, or the reciprocal the 2nd to the 4th reciprocal, or the reciprocal the 2nd to the 5th OFDM symbols carry R-PBCH reciprocal.
Further, when adopting the OFDM symbols carry R-PBCH of varying number, when using 4 OFDM symbols carry R-PBCH, normal cyclic prefix (Normal CP) is different with the bit number behind extended cyclic prefix (ExtendedCP) the carrying R-PBCH coding; Use is during less than 4 OFDM symbols carry R-PBCH, and normal cyclic prefix is identical with bit number behind the extended cyclic prefix carrying R-PBCH coding.
Further, the method for the mapping of described R-PBCH on frequency direction is:
Described R-PBCH is identical or different to the mapping position of Physical Broadcast Channel on frequency direction of terminal links in mapping position on the frequency direction and base station;
Mapping position is identical to be meant on the frequency location that is mapped in each 540kHz about the midbandwidth symmetry;
The mapping position difference is meant that (m/2) * 180kHz represents the band width of m/2 Resource Block RB on the frequency location that is mapped in each (m/2) * 180kHz about the midbandwidth symmetry, the band width of common m RB, i.e. and m*180kHz, wherein m is a positive integer; Or, be mapped in not on the frequency location with the midbandwidth symmetry, the band width of m RB altogether, i.e. m*180kHz, wherein m is a positive integer, describedly can not fix with the frequency location of midbandwidth symmetry or not fix.
Further, the information bit of described R-PBCH and base station are identical or different to the information bit of terminal links Physical Broadcast Channel;
Information bit is identical to be meant: described information bit all adopts the information bit mode of 24bits, and concrete bit implication is identical; Described information bit comprise the base station to the public information between via node and base station to terminal and base station to the identical public information between via node;
The information bit difference is meant: described information bit comprises: the combination of one or more in 3 bit downlink bandwidth dl-Bandwidth, 3 bit PHICH configuration information phich-Config, 8 bit system frame number systemFrameNumber, the 10 bits reservation spare bit; Comprise the base station to the public information between via node and base station to terminal and base station to the identical public information between via node; Described information bit also can comprise other base station except that above-mentioned bit information to the public information between via node.
Further, when described information bit carries out CRC check, the CRC check position is adopted with the base station and is arrived the identical or different scrambling mode of terminal links Physical Broadcast Channel, and identical scrambling mode is meant that the CRC check position scrambling mode of described information bit correspondence is consistent to the corresponding CRC check position scrambling mode of the information bit of terminal links Physical Broadcast Channel with the base station; Different scrambling modes is meant that the CRC check position scrambling mode of utilizing described information bit correspondence carries other base station to the public information between via node.
Further, the constellation modulation system of described R-PBCH and base station are identical or different to the constellation modulation system of terminal links Physical Broadcast Channel; Identical being meant all adopted the QPSK mode, and difference is meant that the modulation system of R-PBCH adopts 16QAM or 64QAM mode.
Another object of the present invention is to provide a kind of Physical Broadcast Channel mapping and emitter of repeated link, for achieving the above object, technical scheme of the present invention is achieved in that
A kind of Physical Broadcast Channel mapping and emitter of repeated link comprise:
The information bit generation module is used to generate the information bit of R-PBCH;
Modulation module is used for R-PBCH is modulated;
The frequency direction mapping block is used on frequency direction R-PBCH being shone upon;
The time orientation mapping block is used on time orientation R-PBCH being shone upon;
Transmitter module is used on back haul link to via node emission R-PBCH;
The time orientation mapping block shines upon R-PBCH on the level of the subframe in radio frames and OFDM symbol respectively; Need satisfy following condition during the mapping R-PBCH of described time orientation mapping block on subframe:
R-PBCH-SF∈{RF|SFN?mod?n＝0}
The subframe that is the R-PBCH mapping belongs to the radio frames that R-PBCH shines upon, and wherein R-PBCH-SF represents the subframe at R-PBCH place, and RF represents the radio frames at R-PBCH place, and SFN represents System Frame Number, and n represents the wireless frame period of R-PBCH mapping, and n is a positive integer; Mod represents to get surplus; In the wireless frame period of R-PBCH mapping, in 1 back haul link subframe backhaul subframe or a plurality of back haul link subframe, carry R-PBCH.
Further, the mapping of time orientation mapping block on the orthogonal frequency division multiplex OFDM symbol refers to: preceding 4 of No. 1 time slot of the subframe that comprises the R-PBCH place, or preceding 3, or preceding 2, or preceding 1 OFDM symbols carry R-PBCH; Or at the second-to-last of No. 0 time slot of the subframe that comprises the R-PBCH place, or the reciprocal the 2nd to the 3rd reciprocal, or the reciprocal the 2nd to the 4th reciprocal, or the reciprocal the 2nd to the 5th OFDM symbols carry R-PBCH reciprocal;
When adopting the OFDM symbols carry R-PBCH of varying number, when using 4 OFDM symbols carry R-PBCH, normal cyclic prefix (Normal CP) is different with the bit number behind extended cyclic prefix (Extended CP) the carrying R-PBCH coding; Use is during less than 4 OFDM symbols carry R-PBCH, and normal cyclic prefix is identical with bit number behind the extended cyclic prefix carrying R-PBCH coding.
Adopt when further, described frequency direction mapping block shines upon R-PBCH on frequency direction and Physical Broadcast Channel mapping position on frequency direction the identical or different mode of base station to terminal links;
Identical being meant on the frequency location that is mapped in each 540kHz about the midbandwidth symmetry; Difference is meant that (m/2) * 180kHz represents the band width of m/2 Resource Block RB on the frequency location that is mapped in each (m/2) * 180kHz about the midbandwidth symmetry, the band width of common m RB, i.e. and m*180kHz, wherein m is a positive integer; Or, be mapped in not on the frequency location with the midbandwidth symmetry, the band width of m RB altogether, i.e. m*180kHz, wherein m is a positive integer, describedly can not fix with the frequency location of midbandwidth symmetry or not fix.
Further, described information bit generation module adopts when generating the information bit of R-PBCH and the information bit identical or different generating mode of base station to the terminal links Physical Broadcast Channel;
Identical generating mode is meant: the information bit mode that all adopts 24bits, concrete bit implication is identical, described information bit comprises the base station to the public information between via node, also comprise the base station to terminal and base station to the identical public information between via node; Different generating modes are meant: described information bit comprises: the combination of one or more in 3 bit downlink bandwidth dl-Bandwidth, 3 bit PHICH configuration information phich-Config, 8 bit system frame number systemFrameNumber, the 10 bits reservation spare bit, described information bit comprises the base station to the public information between via node, also comprise the base station to terminal and base station to the identical public information between via node; Described information bit also can comprise other base station except that above-mentioned bit information to the public information between via node;
Described information bit generation module is when carrying out CRC check to information bit, the CRC check position is adopted with the base station and is arrived the identical or different scrambling mode of terminal links Physical Broadcast Channel, and described identical scrambling mode is meant that the CRC check position scrambling mode of described information bit correspondence is consistent to the corresponding CRC check position scrambling mode of the information bit of terminal links Physical Broadcast Channel with the base station; Described different scrambling mode is meant that the CRC check position scrambling mode of utilizing described information bit correspondence carries other base station to the public information between via node.
Further, described modulation module adopts with the base station identical or different to the constellation modulation system of terminal links Physical Broadcast Channel when R-PBCH is modulated; Identical being meant of constellation modulation system all adopted the QPSK mode; Constellation modulation system difference is meant that the modulation system of R-PBCH adopts 16QAM or 64QAM mode.
In sum, adopt the method for the invention, can be applicable to well that the base station arrives the via node link, mapping mode is simple, both guaranteed backwards compatibility (compatible LTE system), also solve the problem that via node can correctly receive the PBCH that issues from the base station, guaranteed low expense simultaneously.
Description of drawings
Fig. 1 is for introducing the system configuration schematic diagram of via node;
Fig. 2 is a wireless frame structure decomposing schematic representation in the present LTE system;
Fig. 3 is Resource Block and a subcarrier schematic diagram in LTE, the LTE-A system;
The R-PBCH schematic diagram that Fig. 4 is is the cycle with 32 radio frames;
Fig. 5 is with the band width schematic diagram of totally 6 RB on the frequency location of midbandwidth symmetry;
Fig. 6 is not with the band width schematic diagram of totally 3 RB on the frequency location of midbandwidth symmetry.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, by the following examples and with reference to accompanying drawing, the present invention is described in more detail.
Further specify technical scheme of the present invention below in conjunction with accompanying drawing and specific embodiment.
Example one:
Fig. 4 is the mapping mode schematic diagram of R-PBCH on radio frames, subframe, the subframe of R-PBCH mapping is different to the subframe of the Physical Broadcast Channel mapping of terminal links with the base station, the condition that the subframe of R-PBCH mapping satisfies is R-PBCH-SF ∈ { RF|SFN mod n=0}, represent that promptly the subframe of R-PBCH mapping belongs to the radio frames of R-PBCH mapping, wherein R-PBCH-SF represents R-PBCH place subframe, RF represents R-PBCH place radio frames, SFN represents System Frame Number, n represents the wireless frame period of R-PBCH mapping, and is positive integer; The present invention can be carried R-PBCH in one or more back haul link subframes (backhaul subframe) in the wireless frame period of R-PBCH mapping.
In the present embodiment, n gets 32, is the cycle to launch R-PBCH with 32 radio frames, and then the base station is at { the #2 subframe of (for example # 0, #32, #64, #96 radio frames) emission R-PBCH in the RF|SFN mod 32=0} radio frames, wherein RF represents R-PBCH place radio frames, and SFN represents System Frame Number.
Adopt Physical Broadcast Channel the mapping mode on radio frames of above-mentioned base station to via node, only in the radio frames mapping of 32 integral multiples, mapping mode is simple; The LTE system without any influence, is guaranteed backwards compatibility, guaranteed low expense simultaneously.
Example two:
Among the present invention, the Physical Broadcast Channel mapping position on frequency direction to terminal links can be the same or different R-PBCH in mapping position on the frequency direction and base station.
If identical then being mapped in (promptly to be total to the band width of 1.08MHz, totally 72 subcarriers) on each 540kHz frequency location about the midbandwidth symmetry.
If different then can being mapped in the midbandwidth symmetry or not with the frequency location of midbandwidth symmetry, if be mapped on the frequency location with the midbandwidth symmetry, then as shown in Figure 5, about being mapped on each (m/2) * 180kHz band width, (m/2) * 180kHz represents the band width of m/2 RB, be total to the band width of m RB, promptly m*180kHz wherein is a positive integer;
In the present embodiment, R-PBCH is mapped in preceding 4 the OFDM symbols of the 2nd slot among the R-PBCH-SF (also can be mapped in preceding 3 or preceding 2 or preceding 1 the OFDM symbol of the 2nd slot among the R-PBCH-SF); Frequency direction is mapped in on the frequency location of midbandwidth symmetry on the band width of 6 RB totally.
Adopt Physical Broadcast Channel mapping, the frequency direction mapping mode on OFDM symbol of above-mentioned base station to via node, shine upon in 4 OFDM symbols the LTE system without any influence, guaranteed backwards compatibility, mapping is less than guaranteeing low expense in 4 OFDM symbols.
Example three:
R-PBCH is different to Physical Broadcast Channel mapping position on frequency direction of terminal links with the base station in mapping position on the frequency direction, present embodiment is mapped in not on the frequency location with the midbandwidth symmetry, can not fix, or can not fix with the frequency location of midbandwidth symmetry.The present invention can be mapped in R-PBCH the second-to-last or the reciprocal the 2nd of the 1st slot among the R-PBCH-SF to the 3rd of inverse, or the reciprocal the 2nd to the 4th reciprocal, or inverse the 2nd is to the 5th OFDM symbol reciprocal.
As shown in Figure 6, present embodiment is mapped in R-PBCH in the inverse the 2nd and the 3rd OFDM of the 1st slot among the R-PBCH-SF; Frequency direction is mapped in not with on the frequency location of midbandwidth symmetry on the band width of 3 RB totally.
Among the present invention, when adopting 4 OFDM symbols carry R-PBCH, normal cyclic prefix (NormalCP) is different with the bit number behind extended cyclic prefix (Extended CP) the carrying R-PBCH coding, because Normal CP lacks than the reference symbol that Extended CP comprises in these 4 OFDM symbols, the pilot sub-carrier of reference symbol position correspondence can not be used to launch other data, so cause the bit number difference behind the R-PBCH coding; When adopting less than 4 OFDM symbols carry R-PBCH, normal cyclic prefix is identical with the bit number that extended cyclic prefix is carried after R-PBCH encodes, because Normal CP and Extended CP are the same in the reference symbol that this comprises in less than 4 OFDM symbols, so cause the bit number behind the R-PBCH coding identical.
Adopt Physical Broadcast Channel mapping, the frequency direction mapping mode on OFDM symbol of above-mentioned base station to via node, shine upon in 4 OFDM symbols the LTE system without any influence, guaranteed backwards compatibility, mapping is less than guaranteeing low expense in 4 OFDM symbols.
Example four:
Among the present invention, the information bit of R-PBCH and base station can be identical or different to the generating mode of the information bit of terminal links Physical Broadcast Channel; If the identical information bit mode that then all adopts 24bits, concrete bit implication is also identical, and described information bit comprises the base station to the public information between via node, also comprise the base station to terminal and base station to the identical public information between via node; If difference then information bit comprises among dl-Bandwidth (3bits), phich-Config (3bits:1bit phich-Duration and 2bitsphich-Resource), systemFrameNumber (8bits), the spare (10bits) one or more combination, described information bit comprises the base station to the public information between via node, also comprise the base station to terminal and base station to the identical public information between via node; Also can in information bit, comprise other base station to the public information between via node.
For example: the base station can not launched systemFrameNumber or not launch spare or do not launch phich-Resource to the information bit of via node; Other base station can be information such as back haul link subframe configuration information, the change of back haul link sub-frame configuration to the public information between via node.
Example five:
In the specific embodiment of the invention, when the information bit of R-PBCH is carried out CRC check, the CRC check position is adopted with the base station and is arrived the identical or different scrambling mode of terminal links Physical Broadcast Channel, if adopt identical scrambling mode, then do not carrying other base station on the scrambling mode to the public information between via node this moment; If adopt different scrambling modes, then carrying other base station on the scrambling mode to the public information between via node.
When adopting identical scrambling mode, the antenna configurations of supposing the base station is 1 transmit antennas, and then this moment, the base station was to the CRC check position and＜0 of the information bit correspondence of terminal Physical Broadcast Channel, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0〉carries out XOR; The base station is also unified with＜0,0,0,0,0,0 to the CRC check position of the information bit correspondence of via node Physical Broadcast Channel, 0,0,0,0,0,0,0,0,0,0〉carry out XOR, do not carry other base station to the public information between via node by the scrambling mode this moment;
In this specific embodiment, adopt and the information bit different scrambling mode of base station to the terminal Physical Broadcast Channel, among this embodiment, the base station is to the CRC check position and＜0 of the information bit correspondence of via node Physical Broadcast Channel, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0〉or＜1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1〉or＜0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1〉or＜1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0〉carry out XOR, owing to adopted 4 kinds of scramble sequence, therefore different scramble sequence and other base station can be carried out correspondingly to the public information between via node, other base station can be the phich-Resource of 2 bits to the public information between via node, respectively the above-mentioned 4 kinds of scramble sequence of correspondence.
Adopt the information bit of above-mentioned R-PBCH to carry out the CRC check mode, carry out XOR to the CRC check position of the information bit correspondence of via node Physical Broadcast Channel is unified with one of them sequence when the base station, this moment, the via node verification was simple; When XOR is carried out to CRC check position disunity and one of them sequence of the information bit correspondence of via node Physical Broadcast Channel in the base station, can carry other base station to the public information between via node at this moment.
Example six:
Shared OFDM symbolic number difference on the band width difference of base station shared RB on the information bit difference of via node link physical broadcast channel, modulation system difference, the frequency direction, the time orientation, can calculate corresponding effective code check respectively and be:
CR＝INFO
n/(((12*PRB
n)*OFDM
n-(4*PRB
n)*RS
n)*MOD
n)
CR represents the effective code speed code_rate of R-PBCH
INFO
nThe information bit number information_bit_number of expression R-PBCH
PRB
nShared Physical Resource Block PRB_number on the expression R-PBCH frequency direction
OFDM
nShared OFDM symbol numbers ofdm_symbol_number on the expression R-PBCH time orientation
RS
nThe shared reference symbol number reference_symbol_number of expression R-PBCH
MOD
nThe pairing bits of modulation number of expression different modulating modulation_bit_number
For example:
R-PBCH is 24bits, adopts QPSK, takies 6 RB on the frequency direction, takies 3 OFDM symbols on the time orientation, and then effectively code check is CR=24/ ((12*6*3-4*6*2) * 2)=1/14;
R-PBCH is 24bits, adopts 16QAM, takies 6 RB on the frequency direction, takies 2 OFDM symbols on the time orientation, and then effectively code check is CR=24/ ((12*6*2-4*6*2) * 4)=1/16;
R-PBCH is 24bits, adopts 64QAM, takies 4 RB on the frequency direction, takies 1 OFDM symbol on the time orientation, and then effectively code check is CR=24/ ((12*4*2-4*4*1) * 6)=1/20.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (13)
1. mapping of the Physical Broadcast Channel of a repeated link and method for transmitting is characterized in that, comprising:
Generate the information bit of base station to the Physical Broadcast Channel R-PBCH of via node link;
Information bit is carried out chnnel coding, constellation modulation, many antenna processing;
Determine described R-PBCH in mapping position on the frequency direction and mapping position on time orientation, concrete R-PBCH shines upon the subframe that is included in the radio frames and the mapping on the orthogonal frequency division multiplex OFDM symbol on time orientation;
The base station is transmitted to via node at back haul link with it after the mapping of finishing described R-PBCH.
2. method according to claim 1, it is characterized in that, the mapping of described R-PBCH on subframe satisfies condition: R-PBCH-SF ∈ { RF|SFN mod n=0}, the subframe that is the R-PBCH mapping belongs to the radio frames that R-PBCH shines upon, wherein R-PBCH-SF represents the subframe at R-PBCH place, and RF represents the radio frames at R-PBCH place, and SFN represents System Frame Number, n represents the wireless frame period of R-PBCH mapping, and n is a positive integer; Mod represents to get surplus;
In the wireless frame period of R-PBCH mapping, in 1 back haul link subframe backhaul subframe or a plurality of back haul link subframe, carry R-PBCH.
3. method according to claim 1 is characterized in that, the mapping of described R-PBCH on the OFDM symbol is meant:
Preceding 4 of No. 1 time slot of the subframe that comprises the R-PBCH place, or preceding 3, or preceding 2, or preceding 1 OFDM symbols carry R-PBCH; Or;
At the second-to-last of No. 0 time slot of the subframe that comprises the R-PBCH place, or the reciprocal the 2nd to the 3rd reciprocal, or the reciprocal the 2nd to the 4th reciprocal, or the reciprocal the 2nd to the 5th OFDM symbols carry R-PBCH reciprocal.
4. method according to claim 3 is characterized in that, when adopting the OFDM symbols carry R-PBCH of varying number, when using 4 OFDM symbols carry R-PBCH, normal cyclic prefix is different with the bit number behind the extended cyclic prefix carrying R-PBCH coding; Use is during less than 4 OFDM symbols carry R-PBCH, and normal cyclic prefix is identical with bit number behind the extended cyclic prefix carrying R-PBCH coding.
5. method according to claim 1 is characterized in that, determines that the method for the mapping position of R-PBCH on frequency direction is:
Described R-PBCH is identical or different to the mapping position of Physical Broadcast Channel on frequency direction of terminal links in mapping position on the frequency direction and base station;
Described mapping position is identical to be meant on the frequency location that is mapped in each 540kHz about the midbandwidth symmetry;
Described mapping position difference is meant that (m/2) * 180kHz represents the band width of m/2 Resource Block RB on the frequency location that is mapped in each (m/2) * 180kHz about the midbandwidth symmetry, the band width of common m RB, i.e. and m*180kHz, wherein m is a positive integer; Or, be mapped in not on the frequency location with the midbandwidth symmetry, the band width of m RB altogether, i.e. m*180kHz, wherein m is a positive integer, describedly can not fix with the frequency location of midbandwidth symmetry or not fix.
6. method according to claim 1 is characterized in that, the information bit of described R-PBCH and base station are identical or different to the information bit of terminal links Physical Broadcast Channel;
Described information bit is identical to be meant: described information bit all adopts the information bit mode of 24bits, and concrete bit implication is identical; Described information bit comprise the base station to the public information between via node and base station to terminal and base station to the identical public information between via node;
Described information bit difference is meant: described information bit comprises: the combination of one or more in 3 bit downlink bandwidth dl-Bandwidth, 3 bit PHICH configuration information phich-Config, 8 bit system frame number systemFrameNumber, the 10 bits reservation spare bit; Comprise the base station to the public information between via node and base station to terminal and base station to the identical public information between via node; Described information bit also can comprise other base station except that above-mentioned bit information to the public information between via node.
7. method according to claim 6 is characterized in that, when described information bit carried out CRC check, the CRC check position was adopted with the base station and arrived the identical or different scrambling mode of terminal links Physical Broadcast Channel;
Described identical scrambling mode is meant that the CRC check position scrambling mode of described information bit correspondence is consistent to the corresponding CRC check position scrambling mode of the information bit of terminal links Physical Broadcast Channel with the base station;
Described different scrambling mode is meant that the CRC check position scrambling mode of utilizing described information bit correspondence carries other base station to the public information between via node.
8. method according to claim 1 is characterized in that, the constellation modulation system of described R-PBCH and base station are identical or different to the constellation modulation system of terminal links Physical Broadcast Channel; Identical being meant of described constellation modulation system all adopted the QPSK mode; Described constellation modulation system difference is meant that the modulation system of R-PBCH adopts 16QAM or 64QAM mode.
9. the Physical Broadcast Channel of a repeated link shines upon and emitter, comprising:
The information bit generation module is used to generate the information bit of R-PBCH;
Modulation module is used for R-PBCH is modulated;
The frequency direction mapping block is used on frequency direction R-PBCH being shone upon;
The time orientation mapping block is used on time orientation R-PBCH being shone upon;
Transmitter module is used on back haul link to via node emission R-PBCH;
The time orientation mapping block shines upon R-PBCH on the level of the subframe in radio frames and OFDM symbol respectively; Described time orientation mapping block need satisfy following condition when shining upon R-PBCH on subframe:
R-PBCH-SF∈{RF|SFN?mod?n＝0}
The subframe that is the R-PBCH mapping belongs to the radio frames that R-PBCH shines upon, and wherein R-PBCH-SF represents the subframe at R-PBCH place, and RF represents the radio frames at R-PBCH place, and SFN represents System Frame Number, and n represents the wireless frame period of R-PBCH mapping, and n is a positive integer; Mod represents to get surplus; In the wireless frame period of R-PBCH mapping, in 1 back haul link subframe backhaul subframe or a plurality of back haul link subframe, carry R-PBCH.
10. device according to claim 9, it is characterized in that the mapping of time orientation mapping block on the orthogonal frequency division multiplex OFDM symbol refers to: preceding 4 of No. 1 time slot of the subframe that comprises the R-PBCH place, or preceding 3, or preceding 2, or preceding 1 OFDM symbols carry R-PBCH; Or at the second-to-last of No. 0 time slot of the subframe that comprises the R-PBCH place, or the reciprocal the 2nd to the 3rd reciprocal, or the reciprocal the 2nd to the 4th reciprocal, or the reciprocal the 2nd to the 5th OFDM symbols carry R-PBCH reciprocal;
When adopting the OFDM symbols carry R-PBCH of varying number, when using 4 OFDM symbols carry R-PBCH, normal cyclic prefix (Normal CP) is different with the bit number behind extended cyclic prefix (Extended CP) the carrying R-PBCH coding; Use is during less than 4 OFDM symbols carry R-PBCH, and normal cyclic prefix is identical with bit number behind the extended cyclic prefix carrying R-PBCH coding.
11. device according to claim 9 is characterized in that, adopts when described frequency direction mapping block shines upon R-PBCH on frequency direction and Physical Broadcast Channel mapping position on frequency direction the identical or different mode of base station to terminal links;
Described mapping position is identical to be meant on the frequency location that is mapped in each 540kHz about the midbandwidth symmetry;
Described mapping position difference is meant that (m/2) * 180kHz represents the band width of m/2 Resource Block RB on the frequency location that is mapped in each (m/2) * 180kHz about the midbandwidth symmetry, the band width of common m RB, i.e. and m*180kHz, wherein m is a positive integer; Or, be mapped in not on the frequency location with the midbandwidth symmetry, the band width of m RB altogether, i.e. m*180kHz, wherein m is a positive integer, describedly can not fix with the frequency location of midbandwidth symmetry or not fix.
12. device according to claim 9 is characterized in that, described information bit generation module adopts when generating the information bit of R-PBCH and the information bit identical or different generating mode of base station to the terminal links Physical Broadcast Channel;
Described identical generating mode is meant: the information bit mode that all adopts 24bits, concrete bit implication is identical, described information bit comprises the base station to the public information between via node, also comprise the base station to terminal and base station to the identical public information between via node;
Described different generating mode is meant: described information bit comprises 3 bit downlink bandwidth dl-Bandwidth, 3 bit PHICH configuration information phich-Config, 8 bit system frame number systemFrameNumber, 10 bits and reserves one or more combination in the spare bit; Described information bit comprises the base station to the public information between via node, also comprise the base station to terminal and base station to the identical public information between via node; Described information bit also can comprise other base station except that above-mentioned bit information to the public information between via node;
Described information bit generation module is when carrying out CRC check to information bit, the CRC check position is adopted with the base station and is arrived the identical or different scrambling mode of terminal links Physical Broadcast Channel, and described identical scrambling mode is meant that the CRC check position scrambling mode of described information bit correspondence is consistent to the corresponding CRC check position scrambling mode of the information bit of terminal links Physical Broadcast Channel with the base station; Described different scrambling mode is meant that the CRC check position scrambling mode of utilizing described information bit correspondence carries other base station to the public information between via node.
13. device according to claim 9 is characterized in that, described modulation module adopts with the base station identical or different to the constellation modulation system of terminal links Physical Broadcast Channel when R-PBCH is modulated; Identical being meant of constellation modulation system all adopted the QPSK mode; Constellation modulation system difference is meant that the modulation system of R-PBCH adopts 16QAM or 64QAM mode.
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| CN200910088272.0A CN101959240B (en) | 2009-07-13 | 2009-07-13 | Relay link-physical broadcast channel (R-PBCH) mapping and transmitting method and device |
| PCT/CN2010/074437 WO2011006419A1 (en) | 2009-07-13 | 2010-06-24 | Method, apparatus for mapping and transmitting the relay link-physical broadcast channel |
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| CN200910088272.0A CN101959240B (en) | 2009-07-13 | 2009-07-13 | Relay link-physical broadcast channel (R-PBCH) mapping and transmitting method and device |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2011006419A1 (en) | 2011-01-20 |
| CN101959240B (en) | 2014-11-05 |
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