WO2013013538A1

WO2013013538A1 - Method and system for implementing pcfich mapping

Info

Publication number: WO2013013538A1
Application number: PCT/CN2012/076652
Authority: WO
Inventors: 袁明; 毕峰; 吴栓栓; 杨瑾; 梁枫
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-07-26
Filing date: 2012-06-08
Publication date: 2013-01-31
Also published as: CN102904851A

Abstract

Disclosed are a method and a system for implementing PCFICH mapping. The method comprises: performing mapping to first one, two or three OFDM symbols of a first time slot of each sub-frame in a time domain on the basis of an REG, a mapping position in a frequency domain being determined by at least one of the total number of REGs, the number of symbols occupied by the PCFICH, the system bandwidth, the number of sub-carriers in a resource block, and a cell physical layer identifier; and according to the mapping positions in the time domain and frequency domain, applying the REGs to form the PCFICH. The present invention implements the technology of PCFICH mapping, and can solve the problem of transmission reliability of PCFICH of an out-of-band relay in a high-speed mobile scenario, thereby increasing the accuracy of the out-of-band relay (or a terminal of a higher version) receiving the PCFICH, reducing the bit error rate of data transmission, increasing the anti-interference capability of the PCFICH, and improving the transmission efficiency of the whole communication system.

Description

Method and system for realizing PCFICH mapping

The present invention relates to the field of communications, and in particular, to a method and system for implementing a Physical Control Format Indicator Channel (PCFICH) mapping. Background technique

Long Term Evolution (LTE) systems, Advanced Long Term Evolution (LTE-Advanced) systems, and International Mobile Telecommunication Advanced (IMT-Advanced) systems are all Orthogonal Frequency Division Multiplexing ( Based on the Orthogonal Frequency Division Multiplexing (OFDM) technology, the OFDM system is a time-frequency two-dimensional data format. A subframe consists of 2 slots. When the normal Cyclic Prefix (Normal CP) is used, each slot consists of 7 OFDM symbols. Extended Cyclic Prefix (Extended CP) Each slot consists of 6 OFDM symbols.

In each subframe, the physical downlink control channel (PDCCH) of all user equipments (UEs) is fully interleaved and mapped to the first 1 or 2 or 3 of the first slot of each subframe. Or on 4 OFDM symbols. The 2-bit Control Format Indicator (CFI) information uploaded by the PCFICH (Physical Control Format Indicator Channel, PCFICH) can be used to notify the UE of the number of OFDM symbols occupied by the PDCCH. The specific values of the 2-bit CFI are 1, 2, and 3, respectively. The PDCCH occupies the first 1, 2, and 3 OFDM symbols of the first slot of the subframe, and the CFI = 4 is reserved. . specific:

When the downlink system bandwidth ^Ν ^ ^{> 1()} , the number of OFDM symbols that the PDCCH can occupy is 1, 2, or 3, that is, CFI; When the downlink system bandwidth ^{N ≤ 1Q} , the number of OFDM symbols that the PDCCH can occupy is 2, 3, or 4, that is, CFI+1.

In the LTE/LTE-A system, the physical layer processing procedure of the PCFICH is:

First, the 2-bit original CFI is subjected to block coding of (32, 2) to become a 32-bit CFI codeword <b0, bl, ..., b31> (ie, information bits). The specific coding rule is : PCFICH uses a (3, 2) simplex code to add two system bits after 10 repetitions, as shown in Table 1.

Table 1

Secondly, the above 32-bit CFI codewords <b0, bl, b31> are scrambled, then modulated, and modulated by Quaternary Phase Shift Keying (QPSK), and finally 16 modulation symbols are obtained. That is, 16 resource elements (Resource Element, RE).

Finally, after the 16 REs are layer mapped and precoded, each of the four REs is combined into one group in order, that is, the PCFICH is composed of four Resource Element Groups (REGs), which are recorded as REGO to REG3. After that, it is mapped to physical time-frequency resources according to certain rules. The specific rules are as follows:

In the time domain, the four REGs are located on the first OFDM symbol of the first slot of the subframe. In the frequency domain, the positions of the four REGs are obtained by the following four formulas:

REG0 is mapped to ν Λ = Έ as the starting position of 4 consecutive REs;

REG1 is mapped to consecutive 4 REs starting from ^ +^^/ ² ′′ ⁷ ^/ ² ; REG2 is mapped to continuous position starting from ^{fc =} "L ²⁷ / ² "' ^ ^B / ² ₄ REs; REG3 is mapped to consecutive 4 REs starting from ^{fc = fc +} L ^3A ^/ ² "' ^B / ² . The k value directly calculated from the above four formulas needs to be further ^{k = k mod N} ^ ^N - to obtain the final _i ^ « / ² ) ' « ^lm . ^{d 2} L ) , which is the number of downlink resource blocks in the system,

^ is the number of subcarriers in the resource block, which is the physical-layer cell identity (PCID).

In a mobile communication system that introduces a relay node (RN), the link between the base station and the RN is called a relay link (Backhaul Link, or Un Link), and between the RN and the UE under its coverage. The link is called an access link (Access Link, or Uu Link), and the link between the base station and the UE under its coverage is called Direct Link. For the base station, the RN is equivalent to the UE; for the UE, the RN is equivalent to the base station. The base station can be an evolved base station (eNB).

Relay nodes can be divided into two types, namely, in-band relay nodes and out-of-band relay nodes.

For in-band RNs, Un Link and Uu Link use the same frequency band. As shown in Figure 1, both Un Link and Uu Link are used. In order to avoid the RN's own transmission and reception interference, the RN cannot simultaneously perform transmission and reception operations on the same frequency resource. When the RN sends downlink control information to the subordinate UE, the downlink control information from the eNB is not received. Therefore, during downlink transmission, the RN first sends downlink control information to the subordinate UEs on the first 1 or 2 OFDM symbols, and then performs handover from transmission to reception within a period of time. After the handover is completed, the following OFDM symbols are completed. Receiving data from the eNB, including a relay physical downlink control channel (R-PDCCH) and a physical downlink shared channel (PDSCH), that is, an R-PDCCH transmitted by the eNB to the RN Yes 7| is carried on a physical resource block or a physical resource block pair.

For out-band RNs, Un Link and Uu Link occupy two completely different frequency bands. As shown in Figure 2, Un Link uses f, and Uu Link. Therefore, belt The outer RN can receive (transmit) on the same while transmitting (receiving) without interference between them.

In the fixed-band RN of the version (Rel) 10, since the R-PDCCH is carried on the PDSCH and at the same time, in order to reduce the overhead and complexity, it is finally decided not to introduce the PCFICH, but to configure the semi-static mode through the high-level signaling. The start position and end position of the R-PDCCH.

In the 3GPP discussion, Mobile Relay (MR) has become a hot issue. If the mobile relay is out-of-band, it can receive information that the eNB sends on any OFDM symbol for each subframe. Therefore, the PCFICH can be reused to indicate the number of OFDM symbols actually occupied by the downlink control channel of the out-of-band mobile relay.

However, the mobile relay is in a high-speed scene, because high-speed mobile will generate a large Doppler frequency offset, and the OFDM system is highly susceptible to frequency offset, that is, a very d, frequency offset will destroy between subcarriers. Orthogonality, which makes it difficult for users to receive data correctly. In addition, the increase of Doppler frequency offset also makes the channel coherence time shorter, which leads to rapid changes in the wireless channel, which also seriously affects the correct reception of data. Summary of the invention

In view of this, the main object of the present invention is to provide a method and system for implementing PCFICH mapping to ensure correct reception of the PCFICH by an out-of-band mobile relay in a high-speed mobile scenario.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

The present invention provides a method for implementing physical control format indication channel PCFICH mapping, including:

Based on the resource unit group REG, respectively mapped to the first 1 or 2 or 3 orthogonal frequency division multiplexing OFDM symbols of the 1st slot of each subframe in the time domain; the position mapped in the frequency domain by the total number of REGs And determining, by the PCFICH, the number of symbols, the system bandwidth, the number of subcarriers in the resource block, and the physical layer identifier of the cell;

The application of the REG constitutes a PCFICH according to the time domain and the mapping position on the frequency domain. In the above solution, the number of the REGs is N, and the N is: any integer from 4 to 10.

In the above solution, in the time domain, the PCFICH is only mapped to the first OFDM symbol of the first slot of each subframe; or, in the time domain, the PCFICH is mapped to the first slot of each subframe. The first 2 or the first 3 OFDM symbols.

In the above solution, when the PCFICH is mapped only to the first OFDM symbol of the first slot of each subframe in the time domain, in the time domain: the REG is mapped to the first time of each subframe. On the first OFDM symbol of the slot, where N is a positive integer greater than or equal to 5; in the frequency domain: REG0 in the REG is mapped to consecutive 4 REs starting from =; in the REG REG'' ^ ¹ , ² , - "Map in the frequency domain to start with ^{fc =} + L''' ² VN"'Nr/ ² (or fc ₌ fc+L'N^V _s /N) ) On the consecutive ₄ REs of the position, where k = (N^ /2) - «' mod 2 ), _{k = k mod} N . In the time domain, the PCFICH is mapped to the first time slot of each subframe On 2 or the first 3 OFDM symbols, in the time domain: The number of REGs used to carry the PCFICH on OFDM symbol I is "'; where / is the index number of the OFDM symbol; in the frequency domain: OFDM symbol / The first REG used to carry the PCFICH is denoted as ^REG '. The location in the frequency domain is: 4 consecutive REs as the starting position; the ith REG used to carry the PCFICH on the OFDM symbol I, recorded as REG; ('' = 1,2,...,«"1) The frequency domain location is: ψ'' ² 0'"' ^Β / ² (or _{= +} ^'Λ^Λ^Α3⁄4") is the starting 4 consecutive REs; where =(Nr/2).( m ₀ d2 ), = ,, = 1,2 = m ₀ dN . In the above solution, the value of the / is: when the PCFICH is mapped to the first 2 OFDM symbols of the first slot of each subframe, corresponding to / = 0 and 1; when the PCFICH is mapped to the first subframe When the first 3 OFDM symbols of 1 slot are on, corresponding to / = 0, 1 and 2; The value is: when the PCFICH is mapped to the first two OFDM symbols of the first slot of each subframe, ".= / ² " or ".="^ ² ,,

Nm when the PCFICH is mapped onto the first 3 OFDM symbols of the 1st slot of each subframe. When d ³ = 0, «o .

W. = W ₂ = LN / 3 ',; _¾ = ^ - 2 ^ Shang 3 "; or =; _¾ 4 ^ _{3", w 2 = N- 2 N /} 3 "; _Nm. _{When d3 = 2} , "="2=^/3, or _=? 3⁄4 = just,

For the above ( ^{Ζ = 1} , ² ), when ⁼⁽⁾ , the first REG (ie ^REG '.) used to carry the PCFICH on different OFDM symbols is in the same frequency domain position, ie =^;=^ " ₂ =(N _s /2).(A m ₀ d2N _R ^D _B ^L ) _; when Δ _≠ 0, the frequency domain of the first REG (ie ^REG '.) used to carry the PCFICH on different _0FDM symbols The positions are different, that is, offset in the frequency direction;

The mapping manners for the N REGs that make up the PCFICH are: the mapping mode of the first-time domain and the post-frequency domain, or the mapping mode of the pre-frequency domain and the time domain.

In the above solution, the number of symbols occupied by the PCFICH is notified to the receiving end by the network side through high layer signaling.

In the above solution, the number of symbols occupied by the PCFICH is obtained by blind detection at the receiving end. In the above solution, the process of performing the blind detection includes: the receiving end performs blind detection on a specific number of symbols to obtain a true value thereof, and does not perform high layer signaling notification.

In the above solution, when the blind detection is performed, the number of symbols occupied by the PCFICH in the subframe is dynamically variable.

In the above solution, the receiving end includes an outband relay and/or a later version of the user equipment. In the above solution, the network side includes at least one of the following: a base station, a relay node RN, and a network. Off GW, Mobility Management Entity MME, Evolved Universal Terrestrial Radio Access Network EUTRAN, Operations Management and Maintenance OAM Manager.

The present invention also provides a system for implementing PCFICH mapping, including a mapping location decision unit and a PCFICH constituent unit;

The mapping location decision unit is configured to map to the first 1 or 2 or 3 OFDM symbols of the first slot of each subframe in the time domain based on the REG; the location of the mapping in the frequency domain by the total number of REGs And determining, by the PCFICH, the number of symbols, the system bandwidth, the number of subcarriers in the resource block, and the physical layer identifier of the cell;

The PCFICH component is configured to apply a REG to form a PCFICH according to the mapping location in the time domain and the frequency domain.

The technology for implementing PCFICH mapping in the present invention can well solve the problem of transmission reliability of the PCFICH of the out-of-band mobile relay in the high-speed mobile scenario, and improve the accuracy of receiving the PCFICH by the out-of-band relay (or a later version of the terminal). The error rate of data transmission is reduced, the anti-interference ability of PCFICH is increased, and the transmission efficiency of the entire communication system is improved. DRAWINGS

Figure 1 is a system architecture diagram after introducing an in-band relay node;

2 is a system architecture diagram after introducing an outband relay node;

FIG. 3 is a schematic flowchart of implementing PCFICH mapping according to an embodiment of the present invention;

FIG. 4 is a system diagram of implementing PCFICH mapping according to an embodiment of the present invention. detailed description

In practical applications, the PCFICH may be composed of N (N is a positive integer greater than or equal to 4) REGs, which are respectively mapped to the first 1 or 2 of the 1st slot of each subframe in the time domain or On the three OFDM symbols, the position mapped in the frequency domain is determined by the total number of REGs, the number of symbols occupied by the PCFICH, the system bandwidth, the number of subcarriers in the resource block, and the physical layer identifier of the cell. One of the lesser decisions, such as: the total number of REGs, the number of symbols occupied by the PCFICH, the system bandwidth, the number of subcarriers in the resource block, and the d, the physical layer identification of the zone, and the like.

It should be noted that the preferred value of N is: 4, 5, 6, 7, 8, 9, or 10, that is, any integer from 4 to 10.

In the time domain, the PCFICH is only mapped to the first OFDM symbol of the first slot of each subframe, for example, the N REGs are mapped to the first OFDM of the first slot of each subframe. In the symbol, where N is a positive integer greater than or equal to 5.

In the frequency domain:

REG0 is mapped to νΛ = Έ as the starting position of 4 consecutive REs;

R ^E G"'' = 1, ² ,...,N-D maps to L ² VN".N / ² in the frequency domain (or

) for the consecutive _four positions of the starting position, where ( /2) · ( ' mod 2 ), _{k = k} mod N . In the time domain, the PCFICH maps to the first 2 or the first 3 of the 1st time slot of each subframe.

On the OFDM symbol, for example, the number of REGs used to carry the PCFICH on the OFDM symbol I is . Where / is the index number of the OFDM symbol.

In the frequency domain:

The first REG used to carry the PCFICH on the OFDM symbol I is denoted as ^REG '. The location of the frequency domain is: 4 consecutive REs with the starting position of = ';

The ith REG used to carry the PCFICH on OFDM symbol I is denoted REG; ('' = 1,2,...,« _; - 1), where the frequency domain location is: L''. ² 0' /2 (or k 〖 ^=kl +^^ ≤^ /"'") is the continuous 4 REs of the starting position.

Where _t , 1 = , 2 _kl =k N .

When the PCFICH is mapped to the previous OFDM symbol of the first slot of each subframe, Corresponding to / = 0 and 1;

When the PCFICH is mapped to the first 3 OFDM symbols of the 1st slot of each subframe, it corresponds to / = 0, 1 and 2. For the value of '', where N is a positive integer greater than or equal to 4, when the PCFICH is mapped to the first 2 OFDM symbols of the 1st time slot of each subframe: ". =L ^N / ² ” or

3⁄4=Γ ^Ν / ² Ί, Α = Ν- . When the PCFICH is mapped to the first 3 OFDM symbols of the 1st time slot of each subframe: When Nmod3 = 0, »o = »1 =« ₂ =N/3.

When Nmod3 = l, =" ₂ = L ^N /3", ". =Ν - 2. "Ν/3". Or n ₀ =n ₂ = [N/3J ,

When Nmod3 = 2, A = ₂ = "N/3,,". =N— 2. “N/3, . or n ₀ =/3⁄4 = “N/3] , _f =N-2-[ N/3]. or “ ₂ = N - 2. “N/3 . The ( ^{Z = 1} , ² ) , ^Δ ' ^{= ()} represents the same frequency domain location on the different OFDM symbols used to carry the PCFICH (ie ^REG '.), ie ^= =( /2 (m _0d2 N _R D _B ^L ) _{; ≠} 0 represents that the first REG (ie, ^REG 0 ) used to carry the PCFICH on different _OFDM symbols has different frequency domain positions, that is, the frequency direction is biased. The purpose of shifting is to increase the frequency selective gain.

N (N is a positive integer greater than or equal to 4) REGs that constitute PCFICH, that is, REG; (; = 0,1,2,...,N-1), mapped from _REG0 to

REG,' ( = 0,1,2,...,^-1, / = 0,l,2) _o In the mapping process, you can use the mapping method of the time domain after the frequency domain, or you can use the first The mapping of the time domain in the frequency domain; and REG0 can start from any of REG; ( = 0,1,2,···, "1, Ζ = 0,1,2), but preferably REG^

The number of symbols occupied by the PCFICH is notified to the receiving end by the base station through high layer signaling, and the number of symbols can be Semi-static change.

If the number of symbols occupied by the PCFICH in each subframe is dynamically variable, the receiving end needs to blindly detect the specific number of symbols to obtain the true value, and no high-level signaling is needed at this time.

Hereinafter, the present invention will be described in detail using specific embodiments.

Embodiment 1: The base station fixedly configures the PCFICH on the first OFDM symbol of the first slot of each subframe.

Assuming that the system bandwidth is 20MHz, ^^ =100, =12, ' =240 _o p _CFICH consists of N (N is a positive integer greater than or equal to 5) REGs. Assuming N = 8, the 8 REGs are in the frequency domain. The position above is determined by the following formula:

REG0 is mapped to vy, k = consecutive 4 REs at the starting position;

REG'' ^ ¹ ' ² '""" is mapped on the frequency domain to consecutive 4 REs starting from L ^ /Nj^ / ² , where

k = k mod « = k mod 1200 From the above, we can get:

REG0 is mapped to consecutive 4 REs starting from k = 24;

= (k+ [i .2N^ /N" . N _s /2) mod 1200

REG1 is mapped to consecutive 4 REs starting from =( ^{24 +} L ²⁰⁰ / ⁸ "' ¹² / ² ) ^modl200 = ¹⁷⁴ ;

k = kmod N^N^

= (k+ [i .2N^ /N" . N _s /2) mod 1200 REG2 maps to a continuous position with = ( ^{24 +} L ⁴⁰⁽⁾ / ⁸ ′′ ' ¹² / ² ) ^m ° ^dl200 = ³²⁴ 4 REs;

And so on.

Embodiment 2: The base station fixedly configures the PCFICH in the first two slots of the first slot of each subframe. On the OFDM symbol.

Suppose the system bandwidth is 10MHz, ^N ^= ⁵⁰ , ^ ^B=12 , ^ ^eU=350 _o PCFICH consists of N (N is a positive integer greater than or equal to 4) REGs, 3⁄4殳N = 4.

When / = 0 and / = 1, the number of REGs used to carry the PCFICH is two, that is, ". = "i = ^2" .

When / = 0, the frequency domain locations where the ^RE and ^REG pins used to carry the PCFICH are:

^The location of the frequency domain in which ^REG S is located is: consecutive 4 REs with ^ ⁼ as the starting position.

^The location of the frequency domain in which ^REG is located is: consecutive 4 REs starting from ^^Q+LO^ ⁷ ^/ ² .

among them, .

= 6.(350m _O dl00) = 30 , k ₀ = k ₀ mod « = k ₀ mod 600

When /= 1, the frequency domain location of the ^REG ^p ^REG i used to carry the PCFICH is: REG ¹ . The location in the frequency domain is: 4 consecutive REs with the starting position as =.

^The location of the frequency domain in which ^REG i is located is: 4 consecutive REs starting from ^fc ' ⁼ ^+L''' ² 0^ ^B / ² .

Where = ιη. (1600. When ^Δ = ⁰ , the description REGU

The same frequency domain position as the REG is located; when A '≠0, it indicates that REG^ is offset in the frequency direction with respect to REG^. 4 set ^{= 1 () ()} , which leads to:

^RE< ^ is located in the frequency domain: with ^fc . ^=3Q is the continuous 4 REs of the starting position;

= ( +[i- 2 Αο" · N _s /2) mod 600

The position of the frequency domain in which R ^E is located is: consecutive 4 REs starting from =( ³ 0 ₊ ⁵ 0xl ² / ² ) mod ⁶ 00 = ³³ 0; k, =k, mod N^N^

= ^ mod 600 = {k ₀ + A _ffset ) mod 600

REG ¹ . The location in the frequency domain is: = ( ³ 0 + 100) m. d ⁶ 00 = l ³ 0 is the continuous 4 REs of the starting position;

k, =k, mod N^N^

= ( + [ί· 2 _B ^L /n," . ^B 12, mod 600

R ^EG ; The position in the frequency domain is: 4 consecutive REs starting from = (l ³ 0 ₊ ⁵ 0xl ² / ² ) mod ⁶ 00 = ⁴³ 0 .

Finally, the four REGs that make up the PCFICH, namely REGO, REG1, REG2 and REG3, are mapped to ¹ ^ ^} ('' ^{= ()} , ¹ , ⁽⁾ , ¹ ) respectively. If the first time domain is used, the frequency domain mapping method is adopted, and

REG0 is mapped to ^REG , which in turn is: REG1 is mapped to ^REG i° and REG2 is mapped to ^REG1 . ,

REG3 is mapped to ^REG L. If the pre-frequency domain is used, the time domain mapping method is adopted, and REG0 is mapped to

^REG i° , then REG1 maps to ^REG ; , REG2 maps to ^REG , and REG3 maps to ^REC}1 . .

Embodiment 3: The base station fixedly configures the PCFICH on the first two OFDM symbols of the first slot of each subframe.

Suppose the system bandwidth is 15MHz, ^L=75 , ^ ^B=12 , ' = ⁴⁰¹ ₀ PCFICH consists of N (N is a positive integer greater than or equal to 4) REGs, and N = 7 is supported.

When / = 0, the number of REGs used to carry PCFICH: ". =L ^N / ² " = L ⁷ / ² ′′ = ³ ; When 1=1, the number of REGs used to carry PCFICH: N-« . =7-3 = 4.

When / = 0, the frequency domain locations where ¹ ^^ and ^REG ip ^REG °2 are used to carry PCFICH are:

^The location of the frequency domain where ^RE< ^ is located is: ^= . It is the continuous 4 REs of the starting position. REG? ⁽ '· = 1, ²⁾ is located in the frequency domain: ^^^ ² ^. ".^ ³ / ² is the continuous 4 REs of the starting position. among them, . = 6.(401 _mO dl50) = 606

k ₀ = k ₀ mod « = k ₀ mod 900.

/=1, ^REGl used to carry PCFICH. , ^REG ;, ^REGl ₂ and the frequency domain locations are:

REG ¹ . The location in the frequency domain is: The continuous 4 REs of the starting position are considered.

REG; ('· = 1, ² , ³ ) is located in the frequency domain: 4 consecutive REs starting from ^ L OJ^s / ² .

among them, . + . _Ffse , k, =fe _im odN° _B ^L N =^mod900. When =0, the REG is explained. ₀ and REG ¹ . The location of the frequency domain is the same; when ' ^≠() , it indicates ^REGl . The offset is made in the frequency direction with respect to ¹ ^^. 4 set ^{=_2 () ()} , which leads to:

The location of the frequency domain in which R ^EG is located is: ^fc . ⁼⁶⁰⁶ is the last 4 REs of the starting position;

= ( ₊ L,'.2 /".". /2)m _O d900

. In ^{^{^{= (6 0 6 + L 2}}} ><75/3^{_{^{". 6) m O d 9 00}}} = 6 is the initial position of

^REG ^f is in the frequency domain

4 consecutive REs;

= (ξψ··2θ.”·Λ^/2)η χ!900

^REG ° . to = (606 + L4x75/3".6) m. D900 = 306 is the starting position in the frequency domain position

Continuous 4 REs.

k, = k, mod N^N^

= k, mod 900 = ( ξ + Α' _φι „ ) mod 900

: to =(606- 200)mod900 = 406

^{REG is} in the frequency domain position as the continuous 4 REs of the starting position; k, =k, mod N^N^

= ( + [i- 2N _R ^D _B ^L /n," · N _s /2) mod 900

^The location of the frequency domain in which ^REG i is located is: consecutive 4 REs starting from =(406 ₊ L2x75/4"x6) mod 900 = 628;

= ( + [i- 2 ^L In," · N _s /2) mod 900

^The position of the frequency domain in which ^RE< 3⁄4 is located is: consecutive 4 REs starting from =(406 ₊ L4x75/4"x6)mcxi 900 = 856;

= ( + [i- 2N _R ^D _B ^L ” · N _s /2) mod 900

^The position of the frequency domain of ^REGl 3 is: 4 consecutive REs with the starting position of =( ⁴ . ⁶ 4 ⁶ >< ⁷⁵ / ⁴ ">>< ⁶ 0 =.

Finally, map the 7 REQ/C/ = 0,1,2"..,6) that make up the PCFICH to REG (Z=0,i = 0,l,2 _an dZ= = 0,l,2,3 If the first time domain is used, the frequency domain mapping method is adopted, and

REG0 is mapped to ^REG , which in turn is: REG1 is mapped to ^REG i° and REG2 is mapped to ^REG °2.

REG3 is mapped to ^REGl . , REG4 maps to ^REG i , REG5 maps to ^REC}1 2 , REG6 maps to

^REG 3 ₀ uses the mapping method of the time domain after the frequency domain, and REG0 maps to ^REG1 . , in order: REG1 maps to ^REG i° , REG2 maps to ^REG ; REG3 maps to ^REC ^ , REG4 maps to ^REGl 2 , REG5 maps to ^RE< ^ , REG6 maps to ^REC}1 3 . Or, when / = 0, the number of REGs used to carry PCFICH is ". = " ^N/2 ^ = " ^7/2 ^ = ⁴ ;

When /=1, the number of REGs used to carry PCFICH is " ι ^{= Ν _} ". ^{=7_4 = 3} . The specific frequency domain position calculation method is the same as the above related content, and will not be described again.

Embodiment 4: The base station fixedly configures the PCFICH on the first three OFDM symbols of the first slot of each subframe. Assuming that the system bandwidth is 20MHz, ^^ ⁼¹⁰⁰ , ^ ⁼¹² , ' ^{= 240} ₀ PCFICH consists of N (N is a positive integer greater than or equal to 5) REGs, and 4 is N=10.

Since Nmod3 = 10mod3 = l, therefore, when / = ₀ and /=1, it is used to carry PCFICH.

Number of REGs: ".^ / ³ "^ ¹⁰ / ³ ": ³ ; / = 2, the number of REGs used to carry PCFICH: " ₂ = N- 2.LN/3" = 10- 6 = 4. Or, when _/= 1 and _{/ = 2} , the number of REGs used to carry the _PCFICH : = " ² = L ^N / ³ " = L ^{1 (} V ³ ′ = 3; when _z = o, used to carry the PCFICH Number of REGs: ".=N- 2'LN/3" = 10- 6 = 4. Or, _{/ = 0} and _{/ = 2} , the number of REGs used to carry PCFICH: ". ⁼ " ₂ = L ^N /3" ⁼ L ¹⁽ V ³ ′′ ^{= 3} ; / = 0, the number of REGs used to carry PCFICH: A=N- 2'LN/3” = 10- 6 = 4.) / = At 0, the frequency domain locations of ^REG and ^REG ^p ^REG °2 used to carry PCFICH are:

^The location of the frequency domain in which ^REG o is located is: consecutive 4 REs starting from ^k " = ^.

REG? ⁽ '· = 1, ²⁾ is located in the frequency domain: ⁼ ^4''. ² 0. ".^"/ ² is the last 4 REs of the starting position.

^( /2)'( mod2A )

Where =6-(240mod200) = 24 , k ₀ = k ₍₎

= k ₀ mod 1200

/=1, ^REGl used to carry PCFICH. The frequency domain locations where ^REG i and ^REGl 2 are located are:

REG ¹ . The location in the frequency domain is: 4 consecutive REs with the starting position as =. REG; ⁽ '· , ^{2) The} frequency domain position is: 4 consecutive REs starting from ^+L'OJ'^/ ² .

Where + ff _set , = 1^(1^^^= 1^(11200. / = 2, ^REG . ² , ^REG 1 ² , and ^REG 3 ² are located in the frequency domain:

^REG . ^{2 The} frequency domain location is: 4 consecutive REs with ^ = as the starting position.

The position of the frequency domain of R ^EG ' ² " , ² , ³ ) is: 4 consecutive REs with the starting position of ⁼ ^4'·' ² 0 ₂ ′′ ^Β /2.

Where, , fe ₂ = fe ₂ m. d N _R ^D _B ^L N _s = fe ₂ m. Dl200. When = 0 (Z = 1, 2), ^{REG REGl is explained} . Same as the frequency domain location where ^REC ^ is located; when ^{≠ (} ^ ^{= 1} , ² ), the description

^REG o and ^REG . ² is offset in the frequency direction with respect to ^RE< ^.

Finally, map 10 REQ/ C/ = 0,l,2,-,9) constituting PCFICH to REG Z = 0, = 0,l,2 a _n d Z = 2,i = 0,l,2 , . If the mapping mode of the first-time domain and the frequency domain is adopted, and REG0 is mapped to ^REG , then: REG1 is mapped to ^REG i° , REG2 is mapped to ^REG °2, and REG3 is mapped to ^REC}1 . , ERG4 mapped to ^REG 1, REG5 mapped to ^{REC} 1} 2, REG6 mapped to ^REG o, REG7 mapped to ^REG i ^2, REG8 mapped to ^REG 〖, REG9 〖mapped to ^REG. If the mapping mode of the time domain after the frequency domain is adopted, and REG0 is mapped to the ^REG , the sequence is: REG1 is mapped to ^REG1 . , REG2 is mapped to ^REG . ² , REG3 maps to ^REG i° , ERG4 maps to ^REG ; , REG5 maps to ^REG i ² , REG6 maps to ^REG °2 , REG7 maps to ^REC}1 2 , REG8 maps to

^REG 〖, REG9 maps to ^REG 3 ² .

Embodiment 5: The number of symbols occupied by the PCFICH is semi-statically variable.

The base station uses the high-level signaling to pre-configure the number of symbols occupied by the PCFICH in the initial access phase of the receiving end, for example: configuring the first two OFDM symbols of the first time slot of each subframe for the PCFICH, and maintaining for a period of time Unchanged, that is, the out-of-band mobile relay is only in front for a period of time.

The PCFICH is received on 2 OFDM symbols.

When the mobile terminal speed decreases, applying the above 2 OFDM symbols to transmit PCFICH will cause some waste. At this time, the base station will utilize high-level signaling (for example, configuration update message). Reconfiguring the receiver so that the PCFICH occupies only the 1st OFDM symbol of the 1st slot of each subframe. After receiving the high layer signaling, the receiving end receives the PCFICH only on the first OFDM symbol in the next period of time.

Similarly, when the mobile terminal speed increases, it may not be sufficient to transmit the PCFICH by using the above two OFDM symbols. At this time, the base station uses the high layer signaling (such as: configuration update message) to reconfigure the receiver, so that the PCFICH occupies every The first 3 OFDM symbols of the 1st slot of the subframe. After receiving the high layer signaling, the receiving end receives the PCFICH on the first 3 OFDM symbols in the next period of time.

Embodiment 6: The number of symbols occupied by the PCFICH is dynamically variable.

The number of symbols occupied by the PCFICH in each subframe is dynamically variable, and the receiver needs to perform blind detection on it. Assuming that the PCFICH is composed of N = 6 REGs, the receiving end first detects that 6 REGs are mapped only on the 1st OFDM symbol. If the detection is not successful, then 6 REGs are next detected on the first 2 OFDM symbols. In the case, if the detection is still not successful, then the case where 6 REGs are mapped on the first 3 OFDM symbols is detected. In the blind detection process, once the receiving end detects the PCFICH, the detection is stopped.

As shown in the above embodiments, the operation of the present invention for implementing PCFICH mapping can be expressed as shown in Figure 3, and the process includes the following steps:

Step 310: Based on the REG, respectively mapping to the first 1 or 2 or 3 OFDM symbols of the first slot of each subframe in the time domain; the location of the mapping in the frequency domain by the total number of REGs and the PCFICH The number, the system bandwidth, the number of subcarriers in the resource block, and at least one of the cell physical layer identifiers are determined.

Step 320: Apply a REG to form a PCFICH according to the time domain and the mapping position on the frequency domain.

The number of the REGs is N, and the N is: any integer from 4 to 10.

In the time domain, the PCFICH maps only to the first OFDM of the first slot of each subframe. Symbolic; or,

In the time domain, the PCFICH is mapped to the first 2 or first 3 OFDM symbols of the 1st slot of each subframe.

In the time domain, when the PCFICH is mapped only to the first OFDM symbol of the first slot of each subframe, in the time domain: the REG is mapped to the first slot of the first slot of each subframe. On the OFDM symbols, where N is a positive integer greater than or equal to 5; in the frequency domain: REG0 in the REG is mapped to consecutive 4 REs starting from =; REG ^l in the REG, ² ,...^- map to the frequency domain

(or

) for the starting position of ₄ consecutive REs, where

In the time domain, when the PCFICH is mapped to the first 2 or the first 3 OFDM symbols of the first slot of each subframe, in the time domain: the number of REGs used to carry the PCFICH on the OFDM symbol I is "'; where / is the index number of the OFDM symbol; in the frequency domain: OFDM symbol / the first REG used to carry the PCFICH, denoted as ^REG '. The location of the frequency domain is: starting with ^= ' Continuation of 4 REs; OFDM symbol / ith REG for carrying PCFICH, denoted REG; (, ' = 1, 2, ···, ^) where the frequency domain location is: L ² V"'"' ^B /2 (or _{= +} ^''Λ^Λ^Α3⁄4") is the starting 4 consecutive REs; where =( ^B /2)'( mod2A ), k _t =k _{0 +} A ^l _offiet , I = 1,2 _kl =k N . The value of / is:

When the PCFICH is mapped to the first 2 OFDM symbols of the 1st slot of each subframe, corresponding to / = 0 and 1; when the PCFICH is mapped to the first 3 OFDM symbols of the 1st slot of each subframe , corresponding to / = 0, 1 and 2;

The value of the "' is: When the PCFICH is mapped to the first 2 OFDM symbols of the 1st slot of each subframe, ".= / ² " or ". = "^ n _{1 =} Nn ₀ . When the _{PCFICH is} mapped to the 1st of each subframe When the first 3 OFDM symbols of the time slot are Nm.d3 = 0, «o=«i= _3⁄4 = N/3. When _Nmod 3 = l, _ni =n ₂ = [N/3J _? 3⁄4 = N -2-LN/3j . or w. =[Ν/3", _Wl = N-2-[N/3j . or /3,; .

For the ( ^{Z = U} ), when ⁼⁽⁾ , the first REG (ie, ^REG '.) used to carry the PCFICH on different OFDM symbols is in the same frequency domain position, that is, when Δ _≠ 0, different Used on the _0FDM symbol

The first REG (ie ^REG '.) carrying the PCFICH is located in a different frequency domain position, that is, offset in the frequency direction;

The number of symbols occupied by the PCFICH is notified to the receiving end by the network side through high layer signaling. The number of symbols occupied by the PCFICH is obtained by blind detection at the receiving end.

The process of performing the blind detection includes: the receiving end performs blind detection on a specific number of symbols to obtain a real value thereof, and does not perform high layer signaling notification.

When the blind detection is performed, the number of symbols occupied by the PCFICH in the subframe is dynamically variable. The receiving end includes an out-of-band relay and/or a later version of the user equipment.

The network side includes at least one of the following:

Base station, RN, GW, MME, EUTRAN, OAM manager.

In order to ensure the smooth implementation of the above embodiments and operational ideas, the settings shown in FIG. 4 can be performed. Referring to FIG. 4, FIG. 4 is a system diagram of implementing PCFICH mapping according to an embodiment of the present invention, where the system includes a connected mapping location decision unit and a PCFICH constituent unit. In practical applications, the mapping location decision unit can be mapped to the first 1 or 2 or 3 OFDM symbols of the first slot of each subframe in the time domain based on the REG; the mapping position in the frequency domain is The total number of REGs, the number of symbols occupied by the PCFICH, the system bandwidth, the number of subcarriers in the resource block, and at least one of the physical layer identifiers of the cells are determined. The PCFICH constituting unit can apply the REG to form the PCFICH according to the mapping locations in the time domain and the frequency domain.

The number of the REGs is N, and the N is: any integer from 4 to 10.

In the time domain, the PCFICH is mapped only to the first OFDM symbol of the first slot of each subframe; or

In the time domain, when the PCFICH is mapped only to the first OFDM symbol of the first slot of each subframe, in the time domain: the REG is mapped to the first slot of the first slot of each subframe. On the OFDM symbols, where N is a positive integer greater than or equal to 5; in the frequency domain: REG0 in the REG is mapped to consecutive 4 REs starting from =; REG" = 1 in the REG , ² ,..., N - maps to ₄ consecutive REs starting from L ² / ^N ′′′^/ ² (or ^ fc +^' AA /Nj ) in the frequency domain, where k = ( /2) . «' mod 2A ) , _{k = k} mod N . In the time domain, when the PCFICH is mapped to the first 2 or first 3 OFDM symbols of the 1st slot of each subframe, at the time On the domain: the number of REGs used to carry the PCFICH on the OFDM symbol I is "'; where / is the index number of the OFDM symbol; in the frequency domain: the first REG used to carry the PCFICH on the OFDM symbol / ^REG '. The location of the frequency domain is: the consecutive 4 REs of the starting position; the ith REG used to carry the PCFICH on the OFDM symbol I, denoted REG; (, ' = 1,2,··· , ^) The frequency domain location is: L ² V"'"' ^B /2 (or: ^ ^ +^^^^ ³ /"'" ) is the starting position of 4 consecutive REs; =( ^B /2)'( mod2A ), k _t =k _{0 +} A ^l _offiet , I = 1,2 _kl =k N . The value of / is:

The value of the " ' is:

When the PCFICH is mapped to the first 2 OFDM symbols of the 1st slot of each subframe, ".= / ² " or ". = " ² , n _{1 =} Nn ₀ . When the _{PCFICH is} mapped to the first of each subframe When the first 3 OFDM symbols of 1 time slot are Nm.d3 = 0, «o=«i= _3⁄4 = N/3. When _Nmod 3 = l, _ni =n ₂ = [N/3J _{? 3⁄4} = N-2-LN/3j . Or ". =" ₂ = "Ν/3", = Ν_2. "Ν/3"; or /3,;

The number of symbols occupied by the PCFICH is notified to the receiving end by the network side through high layer signaling.

The number of symbols occupied by the PCFICH is obtained by blind detection at the receiving end.

When performing the blind detection, the receiving end is configured to: perform blind detection on a specific number of symbols to Get its true value and do not perform high-level signaling.

The network side includes at least one of the following:

Base station, RN, GW, MME, EUTRAN, OAM manager.

In summary, the method for implementing PCFICH mapping in the present invention can solve the problem of transmission reliability of the PCFICH of the out-of-band mobile relay in the high-speed mobile scenario, and improve the out-of-band relay (or The higher version of the terminal) receives the accuracy of the PCFICH, reduces the bit error rate of the data transmission, increases the anti-interference ability of the PCFICH, and improves the transmission efficiency of the entire communication system.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

Claim

A method for implementing physical control format indication channel PCFICH mapping, comprising: mapping, according to a resource unit group REG, to a first one or two or three orthogonal frequencies of a first time slot of each subframe in a time domain Sub-multiplexed OFDM symbols; the position mapped in the frequency domain is determined by at least one of a total number of REGs, a number of symbols occupied by the PCFICH, a system bandwidth, a number of subcarriers in the resource block, and a physical layer identifier of the cell;

According to the time domain and the mapping position on the frequency domain, the REG is applied to form a PCFICH.

2. The method according to claim 1, wherein the number of the REGs is N, and the N is: any integer from 4 to 10.

3. The method according to claim 1 or 2, wherein

4. The method according to claim 3, wherein

In the time domain, when the PCFICH is mapped only to the first OFDM symbol of the first slot of each subframe, in the time domain: the REG is mapped to the first slot of the first slot of each subframe. On the OFDM symbols, where N is a positive integer greater than or equal to 5; in the frequency domain: REG0 in the REG is mapped to consecutive 4 REs starting from =; REG" = 1 in the REG , ² ,..., N - map to L ² / ^N ′′′^/ ² in the frequency domain (or

) is the starting position of ₄ consecutive REs, where k = ( /2) . «' mod 2A ) , _{k = k} mod N . In the time domain, the PCFICH is mapped to the 1st time slot of each subframe On the first 2 or first 3 OFDM symbols, in the time domain: OFDM symbol I is used to carry the REG of the PCFICH The number is "'; where / is the index number of the OFDM symbol; in the frequency domain: OFDM symbol / the first REG used to carry the PCFICH, denoted as ^REG '. The frequency domain location is: = ' The last 4 REs of the starting position; the ith REG used to carry the PCFICH on the OFDM symbol I, denoted as REG; ('' = U, ..^-1) where the frequency domain location is: ξψ·' ² ν"'"' ^Β / ² (or ⁼ ^+^^ ≤^ /"'" ) is the starting 4 consecutive REs; where 0 + A ^l _o//sei , / = l, 2 Fe, =fe, _mo dN .

5. The method according to claim 4, wherein

The value of / is:

The value of the " ' is:

When the PCFICH is mapped to the first 2 OFDM symbols of the 1st slot of each subframe, ".= / ² " or ". = " ² , n _{1 =} Nn ₀ . When the _{PCFICH is} mapped to the first of each subframe When the first 3 OFDM symbols of 1 time slot are Nm.d3 = 0, «o=«i= _3⁄4 = N/3. When _Nmod 3 = l, _ni =n ₂ = [N/3J _? 3⁄4 = N-2-LN/3j. or w. =[Ν/3", _Wl = N-2-[N/3j . or /3,; .

The first REG (that is, ^REG '.) carrying the PCFICH is located in a different frequency domain location, that is, in the frequency The rate is shifted in the direction;

The method according to claim 1 or 2, wherein the number of symbols occupied by the PCFICH is notified to the receiving end by the network side through high layer signaling.

The method according to claim 1 or 2, wherein the number of symbols occupied by the PCFICH is obtained by blind detection by the receiving end.

8. The method according to claim 7, wherein the performing the blind detection comprises: the receiving end blindly detecting a specific number of symbols to obtain a true value thereof, and not performing high layer signaling.

9. The method according to claim 8, wherein, when the blind detection is performed, the number of symbols occupied by the PCFICH in the subframe is dynamically variable.

10. The method according to claim 8, wherein the receiving end comprises an out-of-band relay and/or a later version of the user equipment.

The method according to claim 1, wherein the network side comprises at least a base station, a relay node RN, a gateway GW, a mobility management entity MME, an evolved universal terrestrial radio access network EUTRAN, operation management, and Maintain the OAM Manager.

12. A system for implementing PCFICH mapping, comprising a mapping location decision unit and a PCFICH constituent unit; wherein

The PCFICH component unit is configured to: according to the mapping location in the time domain and the frequency domain, Apply REG to form PCFICH.

13. The system according to claim 12, wherein the number of the REGs is N, and the N is: any integer from 4 to 10.

14. The system according to claim 12 or 13, wherein

15. The system according to claim 14, wherein

) is the starting position of ₄ consecutive REs, where k = ( /2) . «' mod 2A ) , _{k = k} mod N . In the time domain, the PCFICH is mapped to the 1st time slot of each subframe On the first 2 or the first 3 OFDM symbols, in the time domain: The number of REGs used to carry the PCFICH on OFDM symbol I is "'; where / is the index number of the OFDM symbol; in the frequency domain: The first REG used to carry the PCFICH on the OFDM symbol/ is denoted as ^REG '. The location in the frequency domain is: consecutive 4 REs with the starting position of =; the ith symbol for carrying the PCFICH on the OFDM symbol I REG, denoted REG; ('' = U,.. ^ -1) where the frequency domain is located: ξ ψ·' ² ν"'"' ^Β / ² (or: ^ ^ +^^^^ ³ / "'") is the starting position of 4 consecutive REs; =( ^B /2)'( mod2A ), k _t =k _{0 +} A ^l _offiet , I = 1,2 _kl =k N .

16. The system of claim 15 wherein

The value of / is:

The value of the " ' is:

When the PCFICH is mapped to the first 2 OFDM symbols of the 1st slot of each subframe, ".= / ² " or ". = "^ n _{1 =} Nn ₀ . When the _{PCFICH is} mapped to the 1st of each subframe When the first 3 OFDM symbols of the time slot are on Nm.d3 = 0, «o = «i = «2 = N/3. When _Nmod 3 = l, _ni =n ₂ = [N/3J _{? 3⁄4} = N-2-LN/3j. or ". =" ₂ = "Ν/3", = Ν_2. "Ν/3"; or /3] _;

For the ( ^{Z = U} ), when ⁼⁽⁾ , the first REG (ie, ^REG '.) used to carry the PCFICH on different OFDM symbols is in the same frequency domain position, that is, when Δ _≠ 0, Used on different _0FDM symbols

The system according to claim 12 or 13, wherein the number of symbols occupied by the PCFICH is notified to the receiving end by the network side through high layer signaling.

The system according to claim 12 or 13, wherein the PCFICH occupies The number of symbols is obtained by blind detection at the receiving end.

The system according to claim 18, wherein, when the blind detection is performed, the receiving end is configured to: perform blind detection on a specific number of symbols to obtain a true value thereof, and perform high-level signaling notification.

20. The system according to claim 19, wherein, when the blind detection is performed, the number of symbols occupied by the PCFICH in the subframe is dynamically variable.

21. The system of claim 19, wherein the receiving end comprises an out-of-band relay and/or a later version of the user equipment.

22. The system according to claim 12, wherein the network side comprises at least a base station, an RN, a GW, an MME, an EUTRAN, an OAM manager.