TW201739280A - Method of PUCCH resource allocation and user equipment - Google Patents

Abstract

A method of physical uplink control channel (PUCCH) resource allocation to increase multiplexing capacity in enhanced licensed assisted access (eLAA) is proposed. New design of Physical Uplink Control Channel (PUCCH) is proposed. Across frequency domain of the channel bandwidth, multiple resource block repetitions are allocated for different UEs for uplink PUCCH transmission to satisfy the occupied channel bandwidth requirement for unlicensed carrier access. In addition, the resource elements of a single PUCCH resource block are partially spread into different repetitions to increase multiplexing capacity and to reduce peak to average power ratio (PAPR).

Description

PUCCH resource allocation and peak-to-average power ratio reduction in eLAA 【cross reference】

This application is a continuation of the US non-provisional application 15/423,999, filed on February 3, 2017, entitled "Peak to Average Power Ratio Reduction in eLAA", which is claimed in accordance with 35 USC §120. The above application is hereby incorporated by reference. Application No. 15/423,999, the priority of US Provisional Application No. 62/291,585, entitled "The Method of PAPR Reduction in eLAA", filed on February 5, 2016, in accordance with 35 USC §119; The priority of U.S. Provisional Application Serial No. 62/296,148, entitled,,,,,,,,,,,,, The present application claims priority to U.S. Provisional Application Serial No. 62/316,611, the entire disclosure of which is assigned to the entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire all

The invention relates to wireless network communication, in particular to a peak physical uplink control channel (Physical Uplink Control) in a licensed auxiliary access (LAA) wireless communication system. Channel, PUCCH) resource allocation and peak power ratio (PAPR) are reduced.

The Third Generation Partnership Project (3GPP) and the Long Term Evolution (LTE) mobile telecommunications system provide high data rates, low latency, and improved system performance. With the rapid development of the Internet of Things (IOT) and other new User Equipment (UE), the demand for supporting machine communication has grown exponentially. In order to meet this exponentially growing communication demand, additional spectrum (ie radio spectrum) is required. The number of licensed spectrum is limited, so communication providers need to count on unlicensed spectrum to meet exponential growth in communication demand. One recommended solution is to use a combination of licensed spectrum and unlicensed spectrum. This scheme is called "authorized access" or "LAA". In such an approach, an established communication protocol such as LTE can be used to authorize the spectrum to provide the first communication link, and LTE can also be used for the unlicensed spectrum to provide the second communication link.

In addition, the LAA uses only the unlicensed spectrum to enhance the downlink (DL) through the Carrier Aggregation (CA) process, while the enhanced LAA (eLAA) allows the uplink (UL) stream (stream). ) The 5 GHz unlicensed band is also utilized. Although eLAA is theoretically simple, it is not so simple to actually apply and comply with government regulations regarding the use of unlicensed spectrum. In addition, maintaining technical reliability on secondary unlicensed links requires technical improvements.

In the 3GPP LTE network, the Evolved Universal Terrestrial Radio Access Network (Evolved Universal Terrestrial Radio Access Network, E-UTRAN) includes a plurality of base stations (e.g., evolved Node-Bs (eNBs)) that communicate with a plurality of mobile stations (which may be referred to as UEs). Orthogonal Frequency Division Multiple Access (OFDMA) has been chosen for multipath fading robustness, high spectral efficiency, and bandwidth scalability. Used in LTE DL radio access solutions. Multiple access in the DL is achieved by assigning different subbands of the system bandwidth (i.e., subcarrier groups, referred to as Resource Blocks (RBs)) to each user based on the existing channel conditions of each user. In an LTE network, a Physical Downlink Control Channel (PDCCH) is used for DL scheduling. The Physical Downlink Shared Channel (PDSCH) is used for DL data. Similarly, a Physical Uplink Control Channel (PUCCH) is used to carry UL control information. The Physical Uplink Shared Channel (PUSCH) is used for UL data.

Some countries have requirements for the channel bandwidth occupied by unlicensed carrier access. Specifically, the occupied channel bandwidth should be between 80% and 100% of the declared nominal channel bandwidth. During the established communication, the device is allowed to temporarily operate in a mode in which the channel bandwidth it occupies can be reduced to 40% of the nominal channel bandwidth and the minimum value is 4 MHz. The occupied bandwidth is defined as the bandwidth including the 99% power of the signal. The nominal channel bandwidth is the widest band (at least 5 MHz) of the frequency of the guard band allocated to a single carrier.

Therefore, a PUSCH/PUCCH design is sought to meet The bandwidth requirements of the occupied channel in the eLAA wireless communication network.

The present invention provides a UL transmission method to reduce PAPR in eLAA. A new design of PUCCH and PUSCH is proposed. In the frequency domain of the channel bandwidth, multiple resource allocations are allocated for different UEs to perform UL PUCCH/PUSCH transmission to meet the requirements of the occupied channel bandwidth for the unlicensed carrier access. In addition, UL transmission with co-phase terms is employed to reduce the PAPR of the resulting waveform.

In an embodiment, the UE acquires a set of resource blocks for use in the UL channel in the OFDM wireless communication network, the set of resource blocks being distributed over the frequency domain to occupy a predetermined proportion of the entire channel bandwidth. The UE employs a co-phase vector comprising a set of co-phase terms, wherein each co-phase term of the co-phase vector is applied to a corresponding one of the set of resource blocks. The UE transmits a radio signal containing UL information on the UL channel using the coherent vector.

In another embodiment, the base station allocates a first set of resource blocks to the first UE in the OFDM wireless communication network. The base station allocates a second set of resource blocks to the second UE. The first set of resource blocks and the second set of resource blocks comprise PRBs that form interleaved interlaces in the frequency domain, and each interlace occupies a predetermined proportion of the entire channel bandwidth. The base station simultaneously schedules the first UE and the second UE for UL transmissions on the first set of resource blocks and the second set of resource blocks, respectively.

In another novel aspect, the present invention provides a PUCCH resource allocation method to improve multiplexing capability in an eLAA. A new design of PUCCH is proposed. In the frequency domain of the channel bandwidth, multiple resource blocks are repeatedly allocated to different UEs for UL PUCCH transmission to satisfy the unlicensed carrier access pair. Occupy the channel bandwidth requirements. In addition, resource elements of a single PUCCH resource block are partially spread to form different repetitions to improve multiplexing capability and resource PAPR.

Other embodiments and advantages will be described in the following paragraphs. This section is not intended to limit the invention, and the scope of the invention is defined by the scope of the claims.

100, 200‧‧‧ wireless communication system

101‧‧‧eNB

102-104‧‧‧UE

120, 130‧‧‧PUCCH

201, 211‧‧‧ wireless devices

202, 212‧‧‧ memory

203, 213‧‧‧ processor

204‧‧‧ Scheduler

205‧‧‧Encoder

206, 216‧‧‧RF transceiver

207, 208, 217, 218‧‧ antenna

209, 219‧‧‧OFDM/OFDMA modules

210, 220‧‧‧ Program instructions and information

214‧‧‧Split circuit

215‧‧‧Decoder

221, 231‧‧‧ configuration circuit

232‧‧‧Resource distribution circuit

710, 810‧‧‧ above picture

720, 820‧‧‧ below

1000, 1300‧‧‧

Steps 1101-1103, 1201-1203, 1701-1704, 1801-1804‧‧

1 is a schematic diagram of a wireless communication system with modified PUCCH/PUSCH design and PAPR reduction in accordance with a novel aspect.

2 is a simplified block diagram of a wireless transmitting device and receiving device in accordance with a novel aspect.

Figure 3 is a schematic diagram of an exemplary PUCCH design that satisfies the requirements of the occupied channel bandwidth.

Figure 4 is a schematic diagram of an exemplary PUCCH design of PUCCH format 4 that satisfies the requirements of the occupied channel bandwidth.

Figure 5 is a schematic diagram of another exemplary PUCCH design of PUCCH format 4 that satisfies the requirements of the occupied channel bandwidth.

Figure 6 is a schematic diagram of an exemplary interleaved PUSCH design that satisfies the requirements of the occupied channel bandwidth.

Figure 7 is a schematic diagram of an embodiment of a UL scheduling that deals with hindering problems.

Figure 8 is a schematic diagram of an embodiment of UL scheduling with SRS transmission.

Figure 9 is a schematic diagram of an embodiment of UL transmission on PUCCH or PUSCH employing a co-phase vector to reduce PAPR.

Fig. 10 is a diagram showing an example of a common phase vector using DRMS coefficients.

11 is a flow diagram of a UL transmission method on a PUCCH/PUSCH that can reduce PAPR according to a novel aspect.

Figure 12 is a flow chart of a UL scheduling method for PUCCH/PUSCH from the perspective of a base station in accordance with a novel aspect.

Figure 13 is a diagram showing the multiplexing capability of the PUCCH format 1/1a/1b/2/2a/2b/3/4/5.

Figure 14 is a diagram showing an exemplary PUCCH spread spectrum of a partial RE of an RB according to a novel aspect.

Figure 15 is a diagram showing an exemplary PUCCH block spreading according to a partial RE of a plurality of RBs according to a novel aspect.

Figure 16 is a diagram showing an exemplary PUCCH distribution spreading according to a partial RE of a plurality of RBs according to a novel aspect.

Figure 17 is a flow diagram of a PUCCH resource allocation method employing partial RE spreading from a UE perspective in accordance with a novel aspect.

Figure 18 is a flow diagram of a PUCCH resource allocation method employing partial RE spreading from the perspective of an eNB in accordance with a novel aspect.

Some embodiments of the invention are described in detail below, some of which are illustrated by the accompanying drawings.

1 is a schematic diagram of a wireless communication system with PUCCH/PUSCH design and PAPR reduction in accordance with a novel aspect. Mobile communication network 100 is Orthogonal Frequency Division Multiplexing (Orthogonal Frequency A Division Multiplexing, OFDM)/OFDMA system comprising a base station eNB 101 and a plurality of user equipments UE 102, UE 103 and UE 104. In an OFDMA DL-based 3GPP LTE system, radio resources are divided into sub-frames in the time domain, and each sub-frame contains two slots. Based on the system bandwidth, each OFDMA symbol is further composed of a plurality of OFDMA subcarriers in the frequency domain. The base unit of the resource grid is called a Resource Element (RE), which spans one OFDMA subcarrier on one OFDMA symbol. The REs may constitute a Physical Resource Block (PRB), where each PRB consists of 12 consecutive subcarriers in one slot.

When there is a DL packet to be transmitted from the eNB to the UE, each UE acquires a DL allocation, such as a group of radio resources in the PDSCH. When the UE needs to transmit a packet to the eNB at the UL, the UE obtains a grant for allocating a PUSCH from the eNB, where the PUSCH is composed of a set of UL radio resources. The UE obtains DL or UL scheduling information from a PDCCH that is specifically targeted to the UE. In addition, the broadcast control information is also transmitted to all UEs in the cell in the PDCCH. The DL or UL scheduling information carried by the PDCCH and the broadcast control information are referred to as Downlink Control Information (DCI). When the UE has data or RRC signaling, the uplink control information (UCI) including the HARQ ACK/NACK, the CQI, the MIMO feedback, and the scheduling request is carried by the PUCCH or the PUSCH.

LAA has been proposed to meet exponential growth in communication needs. In the LAA, a combination of licensed spectrum and unlicensed spectrum is employed. Such as LTE Establishing a communication protocol can be used to authorize the spectrum to provide a first communication link, and LTE can also be used for an unlicensed spectrum to provide a second communication link. In addition, the LAA only uses the unlicensed spectrum to enhance the DL through the CA process, while the eLAA allows the UL stream to also utilize the 5 GHz unlicensed band. However, some countries have requirements for the channel bandwidth occupied by unlicensed carrier access. Specifically, the occupied channel bandwidth should be between 80% and 100% of the nominal channel bandwidth stated. As a result, existing PUCCH and PUSCH designs in LTE may not meet such requirements.

In the example shown in Figure 1, PUCCH 120 is assigned to UE 102 for UL control information. The radio resources of the PUCCH 120 need to be spread in the frequency domain to meet the bandwidth requirements of the occupied channels. The PUCCH 130 is assigned to the UE 103 for UL control information. The radio resources of the PUCCH 130 also need to be spread in the frequency domain to meet the bandwidth requirements of the occupied channels. PUCCH 120 and PUCCH 130 form different resource interlaces across the entire frequency domain. Similarly, for PUSCH, if the eNB 101 schedules multiple UEs in a subframe, it may not be able to ensure that each UE's transmissions meet the occupied bandwidth requirements. The radio resources for the PUSCH of each UE therefore need to be spread over the frequency domain. For example, multiple resource interlaces on a nominal channel bandwidth with interleaved PRBs may be allocated to multiple UEs as PUSCHs.

Since many subcarrier components are added by Inverse Fast Fourier Transformation (IFFT) operation, the transmitted signal in the OFDM system can have a higher peak in the time domain. As a result, the OFDM system will have a higher PAPR than a single carrier system. In addition, the LAA requirements for the occupied channel bandwidth may even lead to higher PAPR, because both PUCCH and PUSCH are replicated in resource interleaving throughout the frequency domain. According to a novel aspect, a co-phasing vector is used for replicas on different PRBs to reduce PAPR.

2 is a simplified block diagram of wireless devices 201 and 211 in accordance with a novel aspect. For wireless device 201 (e.g., a transmitting device), antennas 207 and 208 transmit and receive radio signals. The RF transceiver module 206 is coupled to the antenna, receives the RF signal from the antenna, converts it to a baseband signal, and transmits it to the processor 203. The RF transceiver 206 also converts the baseband signal received from the processor to an RF signal and transmits the RF signal to the antennas 207 and 208. The processor 203 processes the received baseband signals and invokes different functional modules and circuits to implement the functions in the wireless device 201. The memory 202 stores program instructions and data 210 to control the operation of the device 201.

Similarly, for wireless device 211 (e.g., receiving device), antennas 217 and 218 transmit and receive radio signals. The RF transceiver module 216 is coupled to the antenna, receives the RF signal from the antenna, converts it to a baseband signal, and transmits it to the processor 213. The RF transceiver 216 also converts the baseband signal received from the processor to an RF signal and transmits the RF signal to the antennas 217 and 218. The processor 213 processes the received baseband signals and invokes different functional modules and circuits to implement the functions in the wireless device 211. The memory 212 stores program instructions and data 220 to control the operation of the wireless device 211.

Wireless devices 201 and 211 also include functional modules and circuits that can be implemented and configured to perform embodiments of the present invention. In the example shown in FIG. 2, the wireless device 201 is a transmitting device, including an encoder 205, a scheduler 204, an OFDMA module 209, and a configuration circuit. 221. The wireless device 211 is a receiving device and includes a decoder 215, a feedback circuit 214, an OFDMA module 219, and a configuration circuit 231. Please note that a wireless device can be either a transmitting device or a receiving device. Different functional modules and circuits can be implemented and configured by software, firmware, hardware, and any combination. When executed by processors 203 and 213 (e.g., by executing code 210 and 220), the functional modules and circuitry allow transmitting device 201 and receiving device 211 to perform embodiments of the present invention.

In an exemplary embodiment, the transmitting device (base station) configures a radio resource (PUCCH/PUSCH) for the UE through the configuration circuit 211, schedules DL and UL transmissions for the UE through the scheduler 204, and encodes the data packet to be transmitted by the encoder 205. The OFDM radio signal is transmitted through the OFDM module 209. The receiving device (UE) acquires the allocated radio resources for the PUCCH/PUSCH through the configuration circuit 231, divides the allocated resources by the dividing circuit 232, distributes the different parts to the allocated resources through the resource distribution circuit 232, and decodes The 215 receives and decodes the DL data packet and transmits the UL information on the PUCCH/PUSCH through the OFDM module 219, wherein the common phase vector is applied to reduce the PAPR of the radio signal.

For the PUCCH formats 1/1a/1a, 2/2a/2b, 3, and 5, the resources occupied in the frequency domain are only 1 PRB, and thus the bandwidth of the occupied channel cannot be satisfied. For PUCCH format 4, there may be multiple resource blocks per PUCCH. PUCCH format 4 contains in the frequency domain Continuous PRB, of which . Since the resource blocks of PUCCH format 4 are contiguous, the requirements for the occupied channel bandwidth may not be met. For the sake of simplicity, the resource allocation of PUCCH format 4 is as follows, where n _s is the slot index and there is a shift between slot 0 and slot 1.

Figure 3 is a schematic diagram of an exemplary PUCCH design that satisfies the requirements of the occupied channel bandwidth. For PUCCH formats 1/1a/1a, 2/2a/2b, 3, and 5, it may be considered to spread the PUCCH resources in the frequency domain to meet the requirements of the occupied channel bandwidth. For example, PUCCH resources may be repeated every M RBs. As shown in Fig. 3, M = 5, and the index of the occupied PUCCH PRB is {1, 56, 11, ..., 96}.

Figure 4 is a schematic diagram of an exemplary PUCCH design of PUCCH format 4 that satisfies the requirements of the occupied channel bandwidth. For PUCCH format 4, two schemes can be considered to meet the requirements of the occupied channel bandwidth. In the example shown in FIG. 4, the PUCCH resource can be block-spread in the frequency domain. For example, PUCCH resources may be repeated every M RBs. As shown in Figure 4, And M = 5. By repeating every 5 PRBs, 3 consecutive PRBs of PUCCH format 4 are spread in the frequency domain. The index of the occupied PRB is {1, 2, 3, 6, 7, 8, 11, 12, 13, ..., 96, 97, 98}.

Figure 5 is a schematic diagram of another exemplary PUCCH design of PUCCH format 4 that satisfies the requirements of the occupied channel bandwidth. In Figure 5, the resources of the PUCCH are first uniformly allocated throughout the bandwidth. Each PUCCH PRB is then spread in the corresponding sub-block or region. For example, in Figure 5, three consecutive PRBs of PUCCH format 4 are spread in the frequency domain by two steps. In the first step, the three PRBs are evenly spread in the frequency domain, which divides the frequency domain into three regions. In the second step, in each region, each PUCCH PRB is repeated every M RBs in the corresponding sub-block/area. The first one in the region of the PUCCH RB [0,32] M of each RB repeat, RB in the PUCCH second region [33, 65] in every M RB repeat, RB in the PUCCH third region [66, 99] repeats every M RBs.

Frequency hopping, such as mirror mapping in intra-subframe frequency hopping, can be used in LTE to meet the channel bandwidth requirements of some UEs. In Rel-10, two types of cluster allocation can also be used. Two cluster assignments can also be used to meet the channel bandwidth requirements of some UEs. However, if the eNB needs to schedule multiple UEs in a subframe, it may not be able to ensure that each UE's transmission meets the occupied channel bandwidth requirements. One possibility is that in areas where bandwidth requirements are occupied, only a limited number of UEs can be scheduled in a subframe and scheduled by the eNB to ensure that the requirements are met.

Figure 6 is a schematic diagram of an exemplary interleaved PUSCH design that satisfies the requirements of the occupied channel bandwidth. Taking a 20 MHz channel as an example, the frequency interval between the first PRB and the last PRB in an interlace is at least 16 MHz, in view of the 80% bandwidth requirement. As shown in FIG. 6, each resource interleave has the same number of resource elements, each resource unit is represented by a rectangular block, and one resource interleaved resource unit is represented by the same shading. (N-1) resource units have a bandwidth <= 2 MHz. A resource interleave is the minimum of resources that can be licensed to the UE. Therefore, N is also The number of UEs that can be scheduled in one subframe at the same time. Assuming that one resource unit is a PRB, 2MHz/180KHz=11. N also needs to be a factor of 100. Therefore, the number N of PRBs in a subframe can be selected as 10. It is assumed that one or more resource interlaces can be granted to the UE, and considering that the FFT size of DFT spreading can only be 2, 3, 5 as its factor, one UE can be licensed to 10, 20, 30 in one subframe. , 40, 50, 60, 80, 90 or 100 PRBs. Depending on the traffic passed on the eLAA UL, the granularity of the resource license may be good or not good enough. When it is found that a better granularity is needed, one solution is to use a smaller resource unit, such as 6 tones for one resource unit, then N=20, and one resource interleave consists of 60 tones. Note that one or more resource interleaves can be used for PUCCH in addition to PUSCH.

Figure 7 is a schematic diagram of an embodiment of UL scheduling for handling block issues. As shown in the upper diagram 710 in FIG. 7, when the eNB schedules two subsequent subframes to different UEs, the UL transmission of the UE 1 may hinder the transmission of the UE 2. In order to avoid this, as shown in the lower diagram 720 in FIG. 7, the UE 1 may drop the last symbol in the subframe n, thereby scheduling the UE to be transmitted in the subframe n+1. 2 Create a Clear Channel Assessment (CCA) opportunity.

Figure 8 is a schematic diagram of an embodiment of a UL Scheduling with Sounding Reference Signal (SRS) transmission. When an aperiodic SRS is transmitted with the PUSCH, the SRS can still occupy the last symbol of the UE uplink transmission. When transmitting a wideband SRS, there is no need to use resource interleaving to spread the signal to the entire channel. In other words, through resources The spread is spread over the entire channel for PUSCH/PUCCH instead of SRS. If the SRS is requested for UE 1 in subframe n, as shown in the upper diagram 810 of Figure 8, further modifications are required. Of course, it is also possible to create an empty symbol at the beginning of the subframe n+1 (instead of the subframe n). The eNB may signal the above in DL control (as in a common PDCCH or a PDCCH dedicated to the UE). Through the signaling of the eNB, the UE scheduled to transmit in the subframe n+1 can know that the CCA opportunity (empty symbol) is determined according to the upper diagram 810 in FIG. 8 (the last OFDM symbol in the subframe n) It is also determined according to the lower diagram 820 in Fig. 8 (the first OFDM symbol in subframe n+1).

Figure 9 is a schematic diagram of an embodiment of UL transmission on PUCCH or PUSCH employing a co-phase vector to reduce PAPR. Assuming that the PUCCH or PUSCH is mapped to a resource interlace, such as all PUBs that are interleaved in one resource, there is a PUCCH, and the PAPR of the resulting waveform may be high. For example, suppose PUCCH format 2 is replicated on 10 PRBs (eg, in a 20 MHz system, resources in 100 PRBs are interleaved to (PRB 1, 11, 21, ..., 91)), then PAPR may Very high. According to a novel aspect, co-phase terms are used to reduce PAPR.

In the example shown in FIG. 9, it is assumed that the PUCCH occupies a PRB, that is, the PUCCH signal is r_{k, l}, where k is a carrier index, and 0<=k<=11. l is the OFDM symbol index of slot 0, and 0 <= l <= 6. At time slot 0, the PUCCH is repeated in the 0th, 20th, 40th, 60th, and 80th PRBs. The copied signal can be expressed as follows: For the 0th RB, y0_{k, 1}=r_{k, l}

For the 20th RB, y1_{k+12*20,l}=r_{k,l}

For the 40th RB, y2_{k+12*40,l}=r_{k,l}

For the 60th RB, y3_{k+12*60,l}=r_{k,l}

For the 80th RB, y4_{k+12*80,l}=r_{k,l}

Since there are 5 repetitions, we need 5 co-phase terms c0, c1, c2, c3, and c4. Then the signal obtained after the common phase becomes: Z0=y0 * C0

Z1=y0 * C1

Z2=y0 * C2

Z3=y0 * C3

Z4=y0 * C4

The same process is performed in time slot 1. It has been demonstrated that the application of some co-phase terms to replicas on different PRBs results in a waveform with a lower PAPR.

Figure 10 is a diagram showing an example of a common phase vector using demodulation reference signal (DRMS) coefficients. Specifically, compared with the simple replication scheme, it is found that the truncated DMRS coefficient can better reduce the PAPR. For example, in a simple copy scheme, for 10 PRB repetitions, the co-phase vector is [1,1,1,1,1,1,1,1,1,1], and all co-phase terms are equal to 1. On the other hand, the base sequence of the DMRS coefficient is: r(n)=e ^{j φ(n)π/4}

- wherein the value of φ(n) is given by the table 1000 in Fig. 10.

For 10 repetitions, due to 10 PRBs in a resource interlace, elements 1-10, 2-11 or 3-12 in a DMRS coefficient of length 12 Selected as a co-phase term of length 10. Note that there are a total of 30 different sets of DMRS coefficients with different values of DMRS, which can be selected by different cellular cells as co-phase terms for different UEs.

11 is a flow diagram of a UL transmission method on a PUCCH/PUSCH that can reduce PAPR according to a novel aspect. In step 1101, the UE acquires a set of resource blocks for use in the UL channel in the OFDM wireless communication network, the set of resource blocks being distributed in the frequency domain to occupy a predetermined proportion of the entire channel bandwidth. In step 1102, the UE employs a co-phase vector comprising a set of co-phase terms, wherein each co-phase term of the co-phase vector is applied to a corresponding one of the set of resource blocks. In step 1103, the UE transmits a radio signal containing UL information on the UL channel employing the coherence vector.

Figure 12 is a flow chart of a UL scheduling method for PUCCH/PUSCH from the perspective of a base station in accordance with a novel aspect. In step 1201, the base station allocates a first set of resource blocks to the first UE in the OFDM wireless communication network. In step 1202, the base station allocates a second set of resource blocks to the second UE. The first set of resource blocks and the second set of resource blocks comprise PRBs that form interleaved interlaces in the frequency domain, and each interlace occupies a predetermined proportion of the entire channel bandwidth. In step 1203, the base station simultaneously schedules the first UE and the second UE for UL transmissions on the first set of resource blocks and the second set of resource blocks, respectively.

PUCCH multiplexing capacity

In addition to meeting the requirements for the occupied channel bandwidth, the PUCCH design should also allow for PUCCH multiplexing of as many different UEs as possible. The table 1300 in Fig. 13 shows the multiplexing capability of the PUCCH format 1/1a/1b/2/2a/2b/3/4/5. PUCCH format 1/1a/1b contains up to 12 cyclic shifts (cyclic Shifts) and 3 orthogonal covering codes, so the maximum multiplexing capacity is 36. The PUCCH format 2/2a/2b contains 12 cyclic shifts, so the multiplexing capability is 12. PUCCH format 3 contains 5 orthogonal cover codes, so the multiplexing capability is 5. Since PUCCH format 4 contains neither cyclic shift nor orthogonal cover code, its multiplexing capability is only one. The PUCCH format 5 uses two orthogonal cover codes, so the multiplexing capability is two.

It is assumed that PUCCH format 4 is used, and it is repeated once every M RBs. When the size of the PUCCH is 1 RB (n=1), a maximum of M PUCCHs from different UEs are multiplexed in one subframe. On the other hand, when the size of the PUCCH is n RBs, the maximum multiplexing in one subframe M/n PUCCH from different UEs. The larger the size of the PUCCH, the lower the multiplexing capability. For example, assume that for all UEs, M=5 and n=1, only 5 PUCCHs from different UEs can be multiplexed in one subframe.

In order to improve the multiplexing capability, we propose a scheme in which the RE of a single PUCCH RB is partially spread once every M RBs. One PUCCH RB is divided into N equal PUCCH parts, each part containing 12/N of 12 REs of the initial PUCCH, where N is selected from {1, 2, 3, 4, 6, 12}. Generally, when part of the RE of the PUCCH is spread, the multiplexing capability of the PUCCH format 4 is N. M/n Is N times the simple repeating method described in the previous figures 3-5.

Figure 14 is a diagram showing an exemplary PUCCH spread spectrum of a partial RE of an RB according to a novel aspect. In the example shown in FIG. 14, each PUCCH occupies one RB (n = 1) containing 12 REs, which is divided into four PUCCH parts, each having 3 REs (N=4) . The different parts are distributed once every 10 RBs (M=10), and each part is repeated every 40 RBs (N*M=40). For example, the first part 1 is repeated in RB0, RB40 and RB80, the second part 2 is repeated in RB10, RB50 and RB90, the third part 3 is repeated in RB20 and RB60, and the fourth part 4 is in RB30 and RB70. repeat. It can be seen that the proposed RE spreading method has a multiplexing capacity N times that of the simple repetition method. With a simple repetition method, the multiplexing capacity when n=1 and M=10 is (M/n)=10. With the proposed partial RE spread spectrum method, the multiplexing capability when n=1, N=4, and M=10 is (4(M/n))=40. This is because each PUCCH RB occupies only 3 REs, and the remaining 9 REs that are not occupied can be used for PUCCH transmission of other UEs.

Figure 15 is a diagram of an exemplary embodiment of partial PUCCH block spreading for multiple UEs in accordance with a novel aspect. In the example shown in Fig. 15, the PUCCH spreading parameters are n = 2, N = 3, and M = 5. The total channel bandwidth in the frequency domain is 25 PRBs, which can be expressed as PRB 0, PRB 1, ..., PRB 24. This means that the PUCCH format occupies 2 consecutive PRBs (n=2), and each PUCCH PRB is divided into 3 equal parts (N=3), which are spread every 5 PRBs in the frequency domain. (M=5). For example, for UE 0, the first PRB is divided into parts 1, 2, and 3, and the second PRB is also divided into parts 1, 2, and 3. Part 1 of the first PRB is distributed on PRB 0, and part 1 of the second PRB is distributed on PRB 1. Part 2 of the first PRB is distributed on PRB 5, and part 2 of the second PRB is distributed on PRB 6. Part 3 of the first PRB is distributed on PRB 10, and part 3 of the second PRB is distributed on PRB 11. The same distribution is repeated on PRB 15, PRB 16, PRB 20 and PRB 21. Similarly, for UE 1, the first PRB is divided into parts 1. 2 and 3, the second PRB is also divided into parts 1, 2 and 3. Part 1 of the first PRB is distributed on PRB 0, and part 1 of the second PRB is distributed on PRB 1. Part 2 of the first PRB is distributed on PRB 5, and part 2 of the second PRB is distributed on PRB 6. Part 3 of the first PRB is distributed on PRB 10, and part 3 of the second PRB is distributed on PRB 11. The same distribution is repeated on PRB 15, PRB 16, PRB 20 and PRB 21. It can be seen that since only a part of the REs of the PUCCH are spread to each PUCCH PRB, UE 0 and UE 1 can share the same PUCCH PRB resource configuration.

In order to allocate different PUCCH resources to each UE, the eNB needs to transmit PUCCH PRB and PUCCH partitions to each UE by signal. For example, for UE 0, the eNB needs to indicate that the PUCCH resource is allocated on part 1 of PRB 0 and part 1 of PRB 1. Similarly, for UE 1, the eNB needs to indicate that the PUCCH resource is allocated on part 3 of PRB 0 and part 3 of PRB 1. If there are other UEs, their PUCCH can be assigned to other locations. For example, the eNB needs to inform the UE 2 that its PUCCH resource starts from PRB 2 and is located in part 2; it informs UE 3 that its PUCCH resource starts from PRB 0 and is located in part 2. After each UE receives its own signaling, it can acquire the allocated PUCCH resources and perform UL transmission.

Figure 16 is a schematic diagram of an example of partial PUCCH distribution mapping and self-spreading for multiple UEs in accordance with a novel aspect. In the example shown in Fig. 16, the PUCCH spreading parameters are n = 2, N = 3, and M = 5. The total channel bandwidth in the frequency domain is 25 PRBs, which can be expressed as PRB 0, PRB 1, ..., PRB 24. This means that the PUCCH format occupies 2 consecutive PRBs (n=2), and each PUCCH PRB is divided into 3 equal parts. Parts (N=3), these parts are spread once every 5 PRBs in the frequency domain (M=5). For UE 0 and UE 1, the first PRB is divided into parts 1, 2 and 3, and the second PRB is also divided into parts 1, 2 and 3. The entire channel bandwidth is divided into n=2 sections, the part of the first RB is mapped to the first segment PRB 0-PRB 11, and the part of the second RB is mapped to the second segment PRB 12-PRB 24. For example, for the first RB, UE 0 and Part 1 of UE 1 are mapped to PRB 0, UE 0 and Part 2 of UE 1 are mapped to PRB 5, part of UE 0 and UE 1 3 is mapped to PRB 10. On the other hand, for the second RB, UE 0 and Part 1 of UE 1 are mapped to PRB 12, and UE 0 and Part 2 of UE 1 are mapped to PRB 17, UE 0 and part of UE 1 3 is mapped to PRB 22.

Compared with the case without spread spectrum, the PAPR of the PUCCH resource when it is spread in the frequency domain becomes larger. Compared with the simple PUCCH repetition method, the PUCCH repetition method in the above partial RE spread spectrum can not only improve the multiplexing capability but also reduce the PAPR. In addition, the aforementioned co-phase vectors can also be employed to further reduce the PAPR of the resulting radio signal waveform.

Figure 17 is a flow diagram of a PUCCH resource allocation method employing partial RE spreading from a UE perspective in accordance with a novel aspect. In step 1701, the UE receives signaling from the base station in an OFDM wireless communication network, wherein the signaling includes information of the PUCCH resource. The PUCCH resource contains a plurality of PUCCH PRBs per M PRBs in the frequency domain to occupy a predetermined proportion of the entire channel bandwidth. In step 1702, the UE divides each PUCCH PRB into N PUCCH portions, each portion containing an equal number of REs. In step 1703, for each PUCCH PRB in the frequency domain, the UE divides one PUCCH part based on signaling. Route to a PRB to obtain PUCCH resources. Finally, in step 1704, the UE transmits a radio signal including UL control information on the acquired PUCCH resource.

Figure 18 is a flow diagram of a PUCCH resource allocation method employing partial RE spreading from the perspective of an eNB in accordance with a novel aspect. In step 1801, the base station allocates PUCCH resources for the UE in the OFDM wireless communication network. The PUCCH resource contains a plurality of PUCCH PRBs per M PRBs in the frequency domain to occupy a predetermined proportion of the entire channel bandwidth. In step 1802, the base station divides each PUCCH PRB into N PUCCH portions, each of which contains an equal number of REs. In step 1803, for each PUCCH PRB on the frequency domain, the base station distributes each PUCCH portion onto one PRB. In step 1804, the base station transmits signaling including PUCCH PRB and PUCCH split information to the UE for UL transmission.

The invention may be embodied in other specific forms without departing from the spirit and scope of the invention. The above-described embodiments are intended to be illustrative only and not to limit the invention, and the scope of the invention is defined by the scope of the appended claims. Equivalent changes and modifications made in accordance with the scope of the present invention should be within the scope of the present invention.

Claims (11)

A method comprising: receiving, by a user equipment, a signaling from a base station in an orthogonal frequency division multiplexing wireless communication network, wherein the signaling includes information of physical uplink control channel resources, and the physical The uplink control channel resource includes a plurality of physical uplink control channel physical resource blocks in each of the M physical resource blocks in the frequency domain to occupy a predetermined ratio of an entire channel bandwidth; each physical uplink control is controlled The channel physical resource block is divided into N physical uplink control channel parts, each part of which contains an equal number of resource elements; for each physical uplink control channel physical resource block in the frequency domain, based on the letter Having a physical uplink control channel portion distributed onto a physical resource block to acquire the physical uplink control channel resource; and transmitting the uplink control on the acquired physical uplink control channel resource A radio signal of information. The method of claim 1, wherein the physical uplink control channel has a format occupying one physical resource block, and the N physical uplink control channel portions are distributed per M physical resource blocks. Once, and each physical uplink control channel portion is repeated every N*M physical resource blocks. The method of claim 1, wherein the physical uplink control channel has a format occupying n consecutive physical resource blocks, and the format is divided into n*N physical uplink control channel units. Share The n*N physical uplink control channel parts are distributed once every M physical resource blocks. The method of claim 3, wherein each n physical uplink control channel portion corresponds to every n consecutive physical resource blocks, and is distributed over n consecutive physical resource blocks of each M physical resource blocks. once. The method of claim 3, wherein an entire channel bandwidth is divided into n segments, and each of the N physical uplink control channel portions corresponds to the n One physical resource block in a contiguous physical resource block is distributed once on one physical resource block of each M physical resource block in one segment of the n segments. The method of claim 1, wherein a common phase vector is applied to the set of resource blocks to reduce a peak-to-average power ratio of the radio signals. The method of claim 6, wherein the common phase vector comprises a plurality of demodulation variable reference signal coefficients. A user equipment, comprising: a receiver for receiving, by a user equipment, a signaling from a base station in an Orthogonal Frequency Division Multiplexing (OFDM) wireless communication network, wherein the signaling includes physical uplink control channel resources Information, and the physical uplink control channel resource includes a plurality of physical uplink control channel physical resource blocks in each of the M physical resource blocks in the frequency domain to occupy a predetermined ratio of a whole channel bandwidth; the dividing circuit For dividing each physical uplink control channel physical resource block into N physical uplink control channel parts, each part of which is packaged Having an equal number of resource elements; a resource allocation circuit for controlling each channel physical resource block for each physical uplink in the frequency domain, and distributing a physical uplink control channel portion to a physical resource based on the signaling Blocking to obtain the physical uplink control channel resource; and a transmitter for transmitting a radio signal including uplink control information on the acquired physical uplink control channel resource. A method includes: allocating a physical uplink control channel resource to a user equipment in an orthogonal frequency division multiplexing wireless communication network, wherein the physical uplink control channel resource includes every M physical resources in a frequency domain Multiple physical uplink control channel physical resource blocks in the block to occupy a predetermined ratio of a whole channel bandwidth; each physical uplink control channel physical resource block is divided into N physical uplink control channel sections And each of the portions includes an equal number of resource elements; for each physical uplink control channel physical resource block in the frequency domain, a physical uplink control channel portion is distributed to one physical resource block; Sending a signaling including the physical uplink control channel physical resource block and physical uplink control channel split information to the user equipment for uplink transmission. The method of claim 9, wherein the physical uplink control channel has a format occupying one physical resource block, the N The physical uplink control channel portion is distributed once every M physical resource blocks, and each physical uplink control channel portion is repeated once every N*M physical resource blocks. The method of claim 9, wherein the physical uplink control channel has a format occupying n consecutive physical resource blocks, the format being divided into n*N physical uplink control channel units And wherein the n*N physical uplink control channel portions are distributed once every M physical resource blocks.