CN106954260B

CN106954260B - Resource allocation method and device

Info

Publication number: CN106954260B
Application number: CN201610007971.8A
Authority: CN
Inventors: 陈林; 张芳
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2016-01-07
Filing date: 2016-01-07
Publication date: 2023-05-30
Anticipated expiration: 2036-01-07
Also published as: WO2017118178A1; CN106954260A

Abstract

The invention discloses a resource allocation method, which is applied to a base station, and comprises the following steps: dividing a scheduling group for user terminals, wherein the user terminals in the same scheduling group have the same optimal transmitting beam in the optimal transmitting-receiving narrow beam pair fed back during beam training; distributing Physical Downlink Control Channel (PDCCH) time-frequency resources and Physical Downlink Shared Channel (PDSCH) resources for the user terminal according to a scheduling group where the user terminal is located; and transmitting PDCCH special control information to the user terminal in the direction of the optimal transmitting beam of the optimal transmitting-receiving narrow beam pair, wherein the PDCCH special control information carries the information of PDSCH resources corresponding to the user terminal. The invention can improve the efficiency of narrow beam scheduling resources and reduce the additional overhead caused by switching between beams at the base station side.

Description

Resource allocation method and device

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for resource allocation.

Background

To achieve the 5G goal: an increase in mobile data traffic per area of 1000 times, an increase in throughput per user of 10 to 100 times, an increase in the number of connected devices of 10 to 100 times, an increase in battery life of low power devices of 10 times and a decrease in end-to-end delay of 5 times, some new wireless solutions must be proposed in 5G.

The two most significant features in 5G are: throughput, peak rate increases by 1-2 orders of magnitude, and end-to-end delay decreases by a factor of two. The use of large bandwidth (500M-1 GHz) in the millimeter wave band is a major solution to address future data traffic throughput exponential growth; while the drop in end-to-end delay is mainly addressed by a scheme that shortens the subframe structure, reducing the HARQ (Hybrid Automatic Repeat Request ) delay.

For high-frequency communication, the transmission of the antenna is generally performed by adopting a beam forming mode due to the large propagation loss of a high-frequency band in the air. To ensure the quality of communication, the downlink control channel PDCCH (Physical Downlink Control Channel ) and the downlink shared channel PDSCH (Physical Downlink Shared Channel ) during service transmission all need to be transmitted in a narrow beam manner on the time domain symbol level. In the existing LTE technology, the PDCCH information is distributed on a plurality of symbols in the time domain, and the working mode of serving a plurality of scheduled UEs (User Equipment) at the same time cannot meet the scheduling policy of a narrow beam; and the resource scheduling granularity taking PRB (Physical Resource Block ) as the resource in LTE can not meet the requirement of flexible scheduling of 5G high-frequency resources.

Therefore, considering the use of beamforming and multi-antenna transmission in 5G, the scheduling of users, the allocation of radio resources, control channels, etc. all need to be redesigned to meet the characteristics of 5G.

Disclosure of Invention

The invention aims to provide a resource allocation method and a resource allocation device, which can improve the efficiency of scheduling resources by narrow beams and reduce the additional overhead caused by switching between beams at the side of a base station.

The invention provides a resource allocation method, which is applied to a base station, and comprises the following steps:

dividing a scheduling group for user terminals, wherein the user terminals in the same scheduling group have the same optimal transmitting beam in the optimal transmitting-receiving narrow beam pair fed back during beam training;

distributing Physical Downlink Control Channel (PDCCH) time-frequency resources and Physical Downlink Shared Channel (PDSCH) resources for the user terminal according to a scheduling group where the user terminal is located;

and transmitting PDCCH special control information to the user terminal in the direction of the optimal transmitting beam of the optimal transmitting-receiving narrow beam pair, wherein the PDCCH special control information carries the information of PDSCH resources corresponding to the user terminal.

Optionally, allocating physical downlink control channel PDCCH time-frequency resources for the user terminal according to a scheduling group where the user terminal is located, including:

PDCCH time-frequency resources corresponding to the user terminals in the same scheduling group are positioned at the same symbol position in the same subframe;

PDCCH time-frequency resources corresponding to the user terminals in different scheduling groups are positioned on different subframes or different symbol positions in the same subframe.

Optionally, the allocating physical downlink shared channel PDSCH resources for the user terminal according to the scheduling group in which the user terminal is located includes:

PDSCH resources corresponding to user terminals within the same scheduling group are on the same or adjacent symbol positions of the same subframe;

PDSCH time-frequency resources corresponding to user terminals in different scheduling groups are located on different subframes or on different symbol positions in the same subframe.

Optionally, the allocating, according to the scheduling group, a physical downlink control channel PDCCH time-frequency resource and a physical downlink shared channel PDSCH time-frequency resource for the user terminal includes:

and taking the frequency resource of one symbol in the time domain as the basic granularity of resource allocation to allocate the PDCCH and PDSCH time-frequency resources.

Optionally, before dividing the scheduling group for the user terminal, the method further includes:

and transmitting Physical Downlink Control Channel (PDCCH) public control information to the user terminal by using the wide beam, carrying out beam refinement training on the user terminal by using the narrow beam, and receiving optimal transmitting-receiving narrow beam pair information fed back by the user terminal.

The invention also provides a resource allocation method applied to the user terminal, which comprises the following steps:

receiving the Physical Downlink Control Channel (PDCCH) special control information sent by a base station in the direction of the optimal receiving beam of the optimal transmitting-receiving narrow beam pair determined in the beam training stage, wherein the information carries the Physical Downlink Shared Channel (PDSCH) resource;

PDSCH resources are demodulated in the direction of the best receive beam of the best transmit-receive narrow beam pair.

Optionally, before receiving the PDCCH dedicated control information sent by the base station, the method further includes:

receiving Physical Downlink Control Channel (PDCCH) common control information sent by a base station in a wide beam, and feeding back optimal transmitting-receiving wide beam pair information to the base station;

and carrying out beam refinement training according to the narrow beams sent by the base station, and feeding back optimal transmitting-receiving narrow beam pair information to the base station.

The invention provides a resource allocation device, which is applied to a base station and comprises:

the grouping module is used for dividing a scheduling group for the user terminals, and the user terminals in the same scheduling group have the same optimal transmitting beam in the optimal transmitting-receiving narrow beam pair fed back during beam training;

the resource allocation module is used for allocating Physical Downlink Control Channel (PDCCH) time-frequency resources and Physical Downlink Shared Channel (PDSCH) resources for the user terminal according to the scheduling group where the user terminal is located;

And the information sending module is used for sending the PDCCH special control information to the user terminal in the direction of the optimal transmitting beam of the optimal transmitting-receiving narrow beam pair, wherein the information carries the information of the PDSCH resources corresponding to the user terminal.

Optionally, the resource allocation module is configured to allocate, for the user terminal, a physical downlink control channel PDCCH time-frequency resource according to a scheduling group where the user terminal is located, and includes:

Optionally, the resource allocation module is configured to allocate physical downlink shared channel PDSCH resources for the user terminal according to a scheduling group where the user terminal is located, and includes:

Optionally, the resource allocation module is configured to allocate, according to the scheduling group, a physical downlink control channel PDCCH time-frequency resource and a physical downlink shared channel PDSCH time-frequency resource to the user terminal, and includes:

Optionally, the apparatus further comprises:

and the beam training module is used for sending the Physical Downlink Control Channel (PDCCH) public control information to the user terminal by using the wide beam, carrying out beam refinement training on the user terminal by using the narrow beam, and receiving the optimal transmitting-receiving narrow beam pair information fed back by the user terminal.

The invention also provides a resource allocation device which is applied to the user terminal and comprises:

the information receiving module is used for receiving the special control information of the physical downlink control channel PDCCH sent by the base station in the direction of the optimal receiving beam of the optimal transmitting-receiving narrow beam pair determined in the beam training stage, wherein the special control information carries the information of the physical downlink shared channel PDSCH resource;

and the service module is used for demodulating the PDSCH resources in the direction of the best receiving beam of the best transmitting-receiving narrow beam pair.

Optionally, the apparatus further comprises:

the beam training module is used for receiving the physical downlink control channel PDCCH public control information sent by the base station in a wide beam and feeding back the optimal transmitting-receiving wide beam pair information to the base station; and carrying out beam refinement training according to the narrow beams sent by the base station, and feeding back optimal transmitting-receiving narrow beam pair information to the base station.

Compared with the prior art, the resource allocation method and the resource allocation device provided by the invention have the advantages that the UE PDCCH resources on the same service beam transmitted by the base station are allocated on the same symbol in the control area, the UE PDCCH resources on different service beams are allocated on different symbols in the control area, the purpose of transmitting in a narrow beam mode is achieved, the transmitted energy is relatively concentrated in the narrow beam mode, the coverage area of the beam is larger, and during service scheduling, the UE on the same transmission beam of the base station are scheduled together, so that the additional overhead caused by switching between beams at the base station side is reduced, and the time division multiplexing is realized between PDCCH-SPECIFIC of the UE of different service beams. When the resources are allocated, the frequency resources on one symbol are used as the basic granularity of scheduling, so that flexible scheduling of the resources working in a beam mode is realized.

Drawings

Fig. 1 is a flowchart (base station side) of a resource allocation method according to an embodiment of the present invention.

Fig. 2 is a flowchart of a resource allocation method (user terminal side) according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of a resource allocation apparatus (base station side) according to an embodiment of the present invention.

Fig. 4 is a schematic diagram of a resource allocation apparatus (user terminal side) according to an embodiment of the present invention.

Fig. 5 is a schematic diagram of an uplink high frequency subframe structure according to an embodiment of the present invention.

Fig. 6 is a schematic diagram of a downlink high frequency subframe structure according to an embodiment of the present invention.

Fig. 7 is a diagram of a hybrid beamforming architecture according to an embodiment of the present invention.

Fig. 8 is a schematic diagram of a high frequency subframe structure according to an embodiment of the present invention.

Fig. 9 is a schematic diagram of a UE position in a beam according to an embodiment of the present invention.

Fig. 10 is a schematic diagram of PDCCH time-frequency resource allocation according to an embodiment of the present invention.

Fig. 11 is a schematic diagram of PDSCH time-frequency resource allocation according to an embodiment of the present invention.

Fig. 12 is a schematic diagram of a UE service access procedure with different beams according to an embodiment of the present invention.

Fig. 13 is a schematic diagram of a service access procedure of the UE with the same beam in the embodiment of the present invention.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail hereinafter with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be arbitrarily combined with each other.

For high-frequency communication, the transmission of the antenna is generally performed by adopting a beam forming mode due to the large propagation loss of a high-frequency band in the air. When the beamforming technology is adopted, the signal coverage effect of the connection state terminal is considered, and the signal coverage effect of the idle state terminal is considered. The system information of all users in the whole cell can be broadcast by using a wide beam. Common data control information for cell users needs to be transmitted in a wide beam manner through a physical downlink control channel PDCCH (Physical Downlink Control Channel).

The invention aims to provide a design and a corresponding resource allocation method of a physical downlink control channel PDCCH of a novel high-frequency multi-antenna subframe structure. For one beam (which can be generalized to a logical beam) transmitted by an antenna, PDCCHs of users receiving the same transmission beam are placed on the same symbol in a control signal region, and a control channel of a single user or multiple users can be placed on one symbol. The public search space and the private search space of the PDCCH are placed in a certain aggregation degree, and the terminal is directly acquired through a blind detection mode. Information including the PDCCH common search space is transmitted in a wide beam for simultaneous reception by a plurality of UEs; PDCCH private search space information for a single UE is transmitted in a narrow beam. The PDCCH narrow beam information used by the UE may inform the UE through a common search space of the wide beam PDCCH. The granularity of the resources allocated to the terminal by the base station takes all frequency resources on one symbol as a basic unit, and the terminals of different beams share the frequency domain resources in a time division mode. When the base station schedules users, the users under the coverage of the same transmitting beam of the antenna are preferentially scheduled at the same time.

To overcome the problem that the PDCCH narrow beam in the high frequency technology can only be used by the user initiating the service, the method is solved by placing public information of a large number of users in the public search space of the PDCCH to send in a wide beam mode, and placing special information for individual users in the private search space of the PDCCH to send in a narrow beam mode. Only one narrow beam is sent on one OFDM (Orthogonal Frequency Division Multiplexing) symbol of the PDCCH in the high-frequency frame structure control region, and the UEs in the same narrow beam are simultaneously scheduled, so that the energy of the PDCCH is concentrated, and the coverage range of a control channel is effectively increased. The method solves the problem of effective coverage reduction caused by the fact that a plurality of PDCCH beams are required to be simultaneously transmitted on the same OFDM symbol.

The invention provides a high-frequency frame structure framework, which divides the whole subframe structure into independent parts: a reference signal and synchronization signal region, a control signal region, a data transmission region, and a control signal feedback region.

The resource allocation method of the invention comprises the following steps:

(1) The base station transmits broadcast information in a wide beam, wherein the broadcast information mainly comprises MIB (Management Information Base ) information; the number of wide beams under one base station can be 2, 4 or 8;

(2) After receiving the broadcast message, the terminal monitors the main synchronization signal, the auxiliary synchronization signal and the broadcast signal of different broadcast beams, acquires the synchronization parameters and demodulates the system information in the MIB;

(3) The terminal further receives PCFICH (Physical Control Format Indicator Channel, physical control format indication channel) and PDCCH-COMMON information through a wide beam, and further acquires SIBs (System Information Block, system information blocks) (SIB 1-SIB 13) information; the terminal performs cell selection and reselection according to the information in the SIBs;

(4) The terminal circularly scans the direction of the receiving beam, and selects the optimal transmitting-receiving beam pair according to the energy of the received synchronous signal or the signal-to-interference-and-noise ratio of the pilot signal;

(5) The terminal initiates a random access request and informs the base station of the best transmitting-receiving beam pair for receiving the broadcast;

(6) After receiving the random access request message of the terminal, the base station returns a random access response message; the message carries the narrow beam measurement request content of the service, such as parameters of a measurement object, a measurement quantity, a measurement period and the like;

(7) The terminal measures the narrow beams of different transmitting directions of the base station, and the measurement of the narrow beams can be carried out aiming at the symbols of the reference signals; after the terminal measurement is finished, determining the optimal transmitting-receiving beam pair of the narrow beam; the concept of a beam here is a logical beam, which may be a beam synthesized by multiple transmit chains;

(8) The base station collects the measurement results of the terminals, classifies the terminals with the same optimal transmission beam in the transmission-reception beam pair as a class, and schedules the terminals on the same transmission beam and the same subframe; the PDCCH is scheduled on the same symbol in the control domain; for different transmitting-receiving beam pairs, staggering scheduling on control domain symbols;

(9) The base station sends PDCCH-SPECIFIC information aiming at SPECIFIC UE, wherein the PDCCH-SPECIFIC information comprises symbol positions of service scheduling, narrow beams ID (Identifier) for transmitting service, uplink PUCCH (Physical Uplink Control Channel) power control information and the like;

(10) The terminal monitors PDCCH-SPECIFIC information on the narrow beam, acquires information such as symbol positions and uplink power control scheduled by a service on a PDSCH (Physical Downlink Shared Channel ) and demodulates corresponding PDSCH information.

The resource allocation method comprises the following characteristics:

1) When the base station service is scheduled, the UE with the same best transmitting beam in the best transmitting-receiving beam pair is scheduled according to the beam, namely PDCCH is scheduled on the same OFDM symbol in a control domain; traffic data is also scheduled on the same or adjacent OFDM symbols in the PDSCH region.

2) When the base station service is scheduled, the PDCCH is scheduled on different symbols in a control domain for the UE of different optimal transmitting beams in the optimal transmitting-receiving beam pair; traffic data is also scheduled on different symbols in the PDSCH region.

3) The beam carrying the PDCCH-COMMON information is transmitted in a wide beam and the beam carrying the PDCCH-SPECIFIC information is transmitted in a narrow beam.

4) And transmitting the beam carrying the PDSCH information in a narrow beam, wherein the beam carrying the PDCCH-SPECIFIC and the PDSCH adopt the same beam pair so as to save the overhead of beam training.

5) The base station transmits a narrow beam ID of a service (PDSCH channel) and informs the UE through a PDCCH-SPECIFIC message; the PDCCH-SPECIFIC message includes a service narrow beam ID and a service PDSCH channel OFDM symbol position for notifying the UE.

6) The terminal Resource allocation unit is not RB (Resource Block) level but symbol level; the frequency resources of one symbol in the time domain are all allocated to one UE as the basic granularity of resource allocation.

In the method, PDCCH resources allocated by UE on the same transmitting beam are on the same symbol in a control region; the PDCCH resources allocated by UEs on different transmit beams are on different symbols of the control region. Thus, the PDCCH-SPECIFIC FIC of the UE in different transmitting beams realizes time division multiplexing, and the mutual interference between control beams is reduced. This has the advantage that the PDCCH-SPECIFIC narrow beam for a SPECIFIC UE (same beam) monopolizes one OFDM symbol due to the larger beam coverage in the energy concentration. During service scheduling, the UE on the same beam schedules together, so that the additional overhead caused by switching between beams is reduced. When the resources are allocated, the frequency resources on one symbol are used as the basic granularity of scheduling, so that the switching scheduling among different beam UEs can be realized through beam scanning.

As shown in fig. 1, an embodiment of the present invention provides a resource allocation method, which is applied to a base station, and the method includes:

s101, dividing a scheduling group for user terminals, wherein the user terminals in the same scheduling group have the same optimal transmitting beam in the optimal transmitting-receiving narrow beam pair fed back during beam training;

S102, distributing Physical Downlink Control Channel (PDCCH) time-frequency resources and Physical Downlink Shared Channel (PDSCH) resources for a user terminal according to a scheduling group where the user terminal is located;

and S103, transmitting PDCCH special control information to the user terminal in the direction of the optimal transmitting beam of the optimal transmitting-receiving narrow beam pair, wherein the PDCCH special control information carries the information of PDSCH resources corresponding to the user terminal.

Wherein, the best transmitting beam refers to the transmitting beam at the base station side, and the best receiving beam refers to the receiving beam at the terminal side;

wherein before dividing the scheduling group for the user terminal, the method further comprises:

Before sending the common control information of the physical downlink control channel PDCCH to the user terminal in the wide beam, the method further comprises the following steps:

periodically transmitting a synchronization message and a broadcast message;

the synchronization message comprises a primary synchronization signal PSS and a secondary synchronization signal SSS; the broadcast message comprises management information base MIB information; the MIB information mainly comprises system parameters such as downlink system bandwidth, the number of transmitting antenna ports, system frame numbers and the like;

Wherein, the PDCCH COMMON control information PDCCH-COMMON information comprises at least one of the following information: SIBs resource block allocation information, transport block size index; the SIBs resource block allocation information comprises the resource positions of SIB1-SIB13 in PDSCH;

the method for carrying out beam refinement training on the user terminal by adopting the narrow beam, receiving the best transmitting-receiving narrow beam pair information fed back by the user terminal comprises the following steps:

receiving a random access request sent by a user terminal, wherein the random access request carries optimal transmitting-receiving wide beam pair information fed back by the user terminal;

transmitting a beam refinement training request to a user terminal, the beam refinement training request carrying at least one of the following information: measuring objects, measuring quantities, measuring periods;

receiving a beam refinement training response message sent by a user terminal, wherein the beam refinement training response message carries optimal transmitting-receiving narrow beam pair information;

the method for allocating the physical downlink control channel PDCCH time-frequency resource to the user terminal according to the scheduling group where the user terminal is located comprises the following steps:

PDCCH time-frequency resources corresponding to the user terminals in different scheduling groups are positioned on different subframes or different symbol positions in the same subframe;

wherein, the information of the PDSCH resource corresponding to the user terminal includes at least one of the following information: symbol positions of PDSCH resources corresponding to the user terminal, narrow beam information of PDSCH, and PUCCH (Physical Uplink Control Channel ) power control information;

wherein, the symbol position of the PDSCH resource corresponding to the user terminal is represented by a start symbol and a symbol length (SymbStart, symbLength); wherein, the narrow beam information of the PDSCH comprises information of transmitting narrow beams and receiving narrow beams;

the allocating physical downlink shared channel PDSCH resources for the user terminal according to the scheduling group in which the user terminal is located includes:

PDSCH time-frequency resources corresponding to user terminals in different scheduling groups are located on different subframes or different symbol positions in the same subframe;

the allocating physical downlink control channel PDCCH time-frequency resource and physical downlink shared channel PDSCH time-frequency resource for the user terminal according to the scheduling group includes:

The frequency resource of one symbol in the time domain is used as the basic granularity of resource allocation to allocate the PDCCH and PDSCH time-frequency resources;

as shown in fig. 2, an embodiment of the present invention provides a resource allocation method, which is applied to a terminal, and the method includes:

s201, receiving the Physical Downlink Control Channel (PDCCH) special control information sent by a base station in the direction of the optimal receiving beam of the optimal transmitting-receiving narrow beam pair determined in the beam training stage, wherein the information carries the Physical Downlink Shared Channel (PDSCH) resource;

s202, demodulating PDSCH resources in the direction of the best receiving beam of the best transmitting-receiving narrow beam pair;

before receiving the PDCCH dedicated control information sent by the base station, the method further comprises:

receiving Physical Downlink Control Channel (PDCCH) common control information sent by a base station in a wide beam, and feeding back optimal transmitting-receiving wide beam pair information to the base station; carrying out beam refinement training according to the narrow beams sent by the base station, and feeding back optimal transmitting-receiving narrow beam pair information to the base station;

wherein the PDCCH common control information includes at least one of the following information: the PDCCH COMMON control information PDCCH-COMMON information comprises at least one of the following information: SIBs resource block allocation information, transport block size index; the SIBs resource block allocation information comprises the resource positions of SIB1-SIB13 in PDSCH;

Wherein the information of the PDSCH resources includes at least one of the following information: symbol positions of PDSCH resources corresponding to the user terminal, narrow beam information of PDSCH, and PUCCH (Physical Uplink Control Channel ) power control information;

as shown in fig. 3, an embodiment of the present invention provides a resource allocation apparatus, which is applied to a base station, including:

Wherein the apparatus further comprises:

The resource allocation module is configured to allocate a physical downlink control channel PDCCH time-frequency resource to a user terminal according to a scheduling group where the user terminal is located, and includes:

The resource allocation module is configured to allocate physical downlink shared channel PDSCH resources for the user terminal according to a scheduling group where the user terminal is located, and includes:

The resource allocation module is configured to allocate, according to a scheduling group, a physical downlink control channel PDCCH time-frequency resource and a physical downlink shared channel PDSCH time-frequency resource to a user terminal, and includes:

As shown in fig. 4, an embodiment of the present invention provides a resource allocation apparatus, which is applied to a user terminal, including:

Wherein the apparatus further comprises:

As shown in fig. 5, an embodiment of the present invention provides an uplink high frequency subframe, including: an uplink reference signal and synchronous signal area, an uplink control signal area, an uplink data transmission area and an uplink control signal feedback area.

Wherein, the uplink reference signal and synchronization signal region includes an uplink Sounding Reference Signal (SRS) and a Preamble (Preamble); the uplink control signal region comprises an uplink control channel; the uplink data transmission area comprises an uplink data channel; the uplink control signal feedback area includes a Guard Period (GP) and a downlink control channel, and the downlink control channel mainly transmits ACK/NACK feedback information.

As shown in fig. 6, an embodiment of the present invention provides a downlink high frequency subframe, including: a downlink reference signal and synchronous signal area, a downlink control signal area, a downlink data transmission area and a downlink control signal feedback area.

Wherein the downlink reference signal and synchronization signal region includes a Reference Signal (RS), a Primary Synchronization Signal (PSS), and a Secondary Synchronization Signal (SSS); the downlink control signal area comprises a downlink control channel and a DM-RS; the downlink data transmission area comprises a downlink data channel; the downlink control signal feedback area comprises GP and uplink control channels, and the uplink control channels mainly transmit ACK/NACK feedback information.

As shown in fig. 7, in an nxm hybrid beamforming architecture, there are N transceivers, each connected to M antennas. ABF (Analog Beamforming ) is an operation on M antennas per transceiver, with the phase of each antenna being adjustable. The DBF (Digital Beamforming ) is an operation on N transceivers, and can perform different phase operations for different frequency points. DAC (Digital Analog Converter) is a digital-to-analog converter, and PA (Power Amplifier) is a Power Amplifier for each antenna. Antenna 0, antenna 1, …, antenna (M-1) represent different antennas of a transceiver, respectively. One transceiver chain is configured as one port, or two transceiver chains are configured as one port, depending on the implementation.

As shown in fig. 8, a high frequency subframe structure includes the following parts: the uplink subframe includes an uplink SRS (Sounding Reference Symbol, sounding reference signal)/Preamble, an uplink control, an uplink data channel, GP (Guard Period), and a downlink control, and the downlink control mainly transmits ACK/NACK feedback information.

The downlink subframe includes RS/PSS/SSS (Reference Signal/Primary Synchronization Signal/Second Synchronization Signal), downlink control, DM-RS, downlink data channel, GP, and uplink control, which mainly transmits ACK/NACK feedback information.

1 radio frame contains 10 radio subframes, each subframe contains 2 slots, each slot contains 7-30 OFDM symbols. Each sub-frame length is 100-250 microseconds.

As shown in fig. 9, the location of the UE in the beam includes two cases: in the first case, only one UE per Beam, for example, UE1 is located in Beam1 and UE2 is located in Beam2, as shown in fig. 9 (a). In the second case, there may be multiple UEs in each Beam, with UE1 and UE2 positions in Beam1 and UE3 position in Beam2, as shown in fig. 9 (b).

As shown in fig. 10, PDCCH time-frequency resource allocation includes two cases: in the first case, there is only one UE in each beam, and the PDCCH resource of each UE is allocated on different OFDM symbols in the downlink control region, as shown in fig. 10 (a). In the second case, if there are multiple UEs in one beam, PDCCH resources of different UEs in the same beam are allocated on the same OFDM symbol in the downlink control region, and PDCCH resources of UEs in different beams are allocated on different OFDM symbols in the downlink control region, as shown in fig. 10 (b). Considering that the length of the high-frequency subframe structure is short, usually 100-250 microseconds, the number of simultaneously scheduled UEs in each subframe is small (1-6), and the requirement of most hot spot scenes can be met by simultaneously scheduling UEs in 1-3 beams in one subframe.

In fig. 10, the CCEs (Control Channel Element ) resources occupied by one PDCCH-COMMON are 8, i.e., the aggregation degree of the COMMON search space is 8, and two sets of resources, PDCCH-common#0 and PDCCH-common#1, are allocated together. The CCEs resources occupied by the PDCCH-SPECIFIC of the UE are 1, 2, 4 and 8, namely the aggregation degree of the private search space is 1, 2, 4 and 8, and a plurality of UEs can be allocated on one symbol. Storing resource block allocation information, transmission block size index and the like related to system information in a UE public search space; the UE private search space stores information such as resource block allocation information related to traffic allocation, narrow beam ID (Identifier) for transmitting traffic, transport block size index, HARQ process number, PUCCH (Physical Uplink Control CHannel ) power control command, and the like. The UE acquires specific information in the public search space and the private search space through blind detection.

As shown in fig. 11, when PDSCH (Physical Downlink Shared Channel ) time-frequency resource allocation is performed, each UE allocates several OFDM symbols of the downlink data channel, and in fig. 10, UE1 allocates consecutive 2 OFDM symbols and UE2 allocates consecutive 3 OFDM symbols. The main feature of OFDM symbol allocation is that 1 OFDM symbol is allocated to only 1 UE.

As shown in fig. 12, considering the case that there are 1 UE in each traffic beam and 2 beams in total, the resource allocation method includes the steps of:

step S1200: the base station periodically transmits synchronous and broadcast messages; the synchronous signal comprises a primary synchronous information PSS and a secondary synchronous signal SSS, and the broadcast message comprises MIB information; the MIB information mainly comprises system parameters such as downlink system bandwidth, the number of transmitting antenna ports, system frame numbers and the like; the base station transmits the message in a wide beam form;

step S1201: UE1 obtains a specific physical cell number of a base station through PSS and SSS solution, and performs downlink synchronization; UE1 acquires system parameters in MIB by demodulating PBCH (Physical Broadcast Channel, physical Broadcast Channel, physical broadcast channel);

step S1202: UE2 obtains specific physical cell numbers of the base station through PSS and SSS solutions, and performs downlink synchronization; UE2 obtains system parameters in MIB by demodulating PBCH (Physical Broadcast Channel);

step S1203: the base station sends PDCCH public information, and the PDCCH-COMMON information comprises SIBs resource block allocation information and a transmission block size index; the SIBs resource block allocation information contains the locations of SIB1-SIB13 resources in PDSCH; the base station transmits the message in a wide beam form;

Step S1204: UE1 acquires the resource position of SIBs in PDSCH and demodulates corresponding information by blind detection of information in PDCCH-COMMON, and performs cell selection and reselection according to cell information contained in the SIBs;

step S1205: the UE1 circularly scans the direction of a receiving beam, and obtains the optimal transmitting-receiving beam pair 1 (base station transmitting-UE receiving) of the wide beam through measuring the energy of a synchronous signal or the signal-to-interference-noise ratio (SINR) of a downlink pilot signal;

step S1206: UE2 acquires the resource position of SIBs in PDSCH and demodulates corresponding information by blindly detecting information in PDCCH-COMMON, and performs cell selection and reselection according to cell information contained in the SIBs;

step S1207: the UE2 circularly scans the direction of the receiving beam, and obtains the optimal transmitting-receiving beam pair 2 (base station transmitting-UE receiving) of the wide beam through measuring the energy of the synchronous signal or the signal-to-interference-noise ratio SINR of the downlink pilot signal;

step S1208: UE1 initiates a random access request and informs a base station of the optimal transmitting-receiving beam pair 1 information of a wide beam;

step S1209: the UE2 initiates a random access request and informs the base station of the optimal transmitting-receiving beam pair 2 information of the wide beam;

step S1210: the base station informs the UE1 of a beam refinement training request in a random access response message initiated later; the information of specific measurement objects, measurement quantity, measurement period and the like is included in the beam refinement training request information element;

Step S1211: the base station informs the UE2 of a beam refinement training request in a random access response message initiated later; the information of specific measurement objects, measurement quantity, measurement period and the like is included in the beam refinement training request information element;

step S1212: UE1 performs narrow beam training: measuring energy or signal-to-interference-plus-noise ratio (SINR) of different transmitting beams of a base station by circularly scanning the direction of the receiving beam, and selecting a transmitting-receiving beam pair with the largest capability or the best signal-to-interference-plus-noise ratio as a narrow beam optimal transmitting-receiving beam pair 3;

step S1213: UE2 performs narrow beam training: measuring energy or signal-to-interference-plus-noise ratio (SINR) of different transmitting beams of a base station by circularly scanning the direction of the receiving beam, and selecting a transmitting-receiving beam pair with the largest capability or the best signal-to-interference-plus-noise ratio as a narrow beam optimal transmitting-receiving beam pair 4;

step S1214: UE1 informs the base station of the optimal narrow beam transmitting-receiving beam pair 3 through a beam refinement training response message;

step S1215: the UE2 informs the base station of the optimal transmitting-receiving beam pair 4 of the narrow beam through a beam refinement training response message;

step S1216: the base station dispatches the UE reporting the same optimal transmitting-receiving beam pair on the same subframe according to the result of the narrow beam training of different UEs, and PDCCH resources are distributed on the same symbol of the control channel region; the method comprises the steps that UE reporting different optimal transmitting-receiving beam pairs is distributed with PDCCH resources on different symbols of a control channel region or scheduled on different subframes;

Step S1217: the base station indicates the resource position allocated to the PDSCH region for each UE in the PDCCH; the resource location is represented by a start symbol, a symbol length (SymbStart, symbLength);

step S1218: the base station informs the UE1 of PDCCH-SPECIFIC information in the transmitting direction of the optimal transmitting-receiving beam pair fed back by the UE1, wherein the information comprises resource allocation information of the UE1 in a PDSCH region and a narrow beam transmitting-receiving narrow beam pair 3 carrying service; the base station transmits the message in a narrow beam mode;

step S1219: the base station informs the UE2 of PDCCH-SPECIFIC information in the transmitting direction of the optimal transmitting-receiving beam pair fed back by the UE2, wherein the information comprises resource allocation information of the UE2 in a PDSCH region and a narrow beam transmitting-receiving narrow beam pair 4 carrying service; the base station transmits the message in a narrow beam mode;

step S1220: UE1 demodulates PDSCH resources in a receiving beam direction corresponding to the optimal transmitting-receiving narrow beam pair 3;

step S1221: UE2 demodulates PDSCH resources in the receive beam direction corresponding to the optimal transmit-receive narrow beam pair 4.

The above embodiment uses only 2 beams as an illustration, and the combination situation of the UE and the beams can be generalized to any scenario of more than 2 beams.

As shown in fig. 13, considering the case where there are 2 UEs in one beam, the resource allocation method includes the steps of:

step S1300: the base station periodically transmits synchronous and broadcast messages; the synchronous signal comprises a primary synchronous information PSS and a secondary synchronous signal SSS, and the broadcast message comprises MIB information; the MIB information mainly comprises system parameters such as downlink system bandwidth, the number of transmitting antenna ports, system frame numbers and the like; the base station transmits the message in a wide beam form;

step S1301: UE1 obtains a specific physical cell number of a base station through PSS and SSS solution, and performs downlink synchronization; UE1 obtains system parameters in MIB by demodulating PBCH (Physical Broadcast Channel);

step S1302: UE2 obtains specific physical cell numbers of the base station through PSS and SSS solutions, and performs downlink synchronization; UE2 obtains system parameters in MIB by demodulating PBCH (Physical Broadcast Channel);

step S1303: the base station sends PDCCH public information, and the PDCCH-COMMON information comprises SIBs resource block allocation information and a transmission block size index; the SIBs resource block allocation information contains the locations of SIB1-SIB13 resources in PDSCH; the base station transmits the message in a wide beam form;

step S1304: UE1 acquires the resource position of SIBs in PDSCH and demodulates corresponding information by blind detection of information in PDCCH-COMMON, and performs cell selection and reselection according to cell information contained in the SIBs;

Step S1305: the UE1 circularly scans the direction of a receiving beam, and obtains the optimal transmitting-receiving beam pair 1 (base station transmitting-UE receiving) of the wide beam through measuring the energy of a synchronous signal or the signal-to-interference-noise ratio (SINR) of a downlink pilot signal;

step S1306: UE2 acquires the resource position of SIBs in PDSCH and demodulates corresponding information by blindly detecting information in PDCCH-COMMON, and performs cell selection and reselection according to cell information contained in the SIBs;

step S1307: the UE2 circularly scans the direction of the receiving beam, and obtains the optimal transmitting-receiving beam pair 1 (base station transmitting-UE receiving) of the wide beam through measuring the energy of the synchronous signal or the signal-to-interference-noise ratio SINR of the downlink pilot signal;

step S1308: UE1 initiates a random access request and informs a base station of the optimal transmitting-receiving beam pair 1 information of a wide beam;

step S1309: UE2 initiates a random access request and informs the base station of the optimal transmitting-receiving beam pair 1 information of the wide beam;

step S1310: the base station informs the UE1 of a beam refinement training request in a random access response message initiated later; the information of specific measurement objects, measurement quantity, measurement period and the like is included in the beam refinement training request information element;

Step S1311: the base station informs the UE2 of a beam refinement training request in a random access response message initiated later; the information of specific measurement objects, measurement quantity, measurement period and the like is included in the beam refinement training request information element;

step S1312: UE1 performs narrow beam training: measuring energy or signal-to-interference-plus-noise ratio (SINR) of different transmitting beams of a base station by circularly scanning the direction of the receiving beam, and selecting a transmitting-receiving beam pair with the largest capability or the best signal-to-interference-plus-noise ratio as a narrow beam optimal transmitting-receiving beam pair 2;

step S1313: UE2 performs narrow beam training: measuring energy or signal-to-interference-plus-noise ratio (SINR) of different transmitting beams of a base station by circularly scanning the direction of the receiving beam, and selecting a transmitting-receiving beam pair with the largest capability or the best signal-to-interference-plus-noise ratio as a narrow beam optimal transmitting-receiving beam pair 2;

step S1314: UE1 informs the base station of the optimal transmitting-receiving beam pair 2 of the narrow beam through a beam refinement training response message;

step S1315: UE2 informs the base station of the optimal transmitting-receiving beam pair 2 of the narrow beam through a beam refinement training response message;

step S1316: the base station dispatches the UE reporting the same optimal transmitting-receiving beam pair on the same subframe according to the result of the narrow beam training of different UEs, and PDCCH resources are distributed on the same symbol of the control channel region;

Step S1317: the base station indicates the resource position allocated to the PDSCH region for each UE in the PDCCH; the resource location is represented by a start symbol, a symbol length (SymbStart, symbLength);

step S1318: the base station informs the UE1 and the UE2 of PDCCH-SPECIFIC information in the transmitting direction of the optimal transmitting-receiving beam pair 2 fed back by the UE1 and the UE2, wherein the information comprises resource allocation information of the UE1 and the UE2 in a PDSCH region and the optimal transmitting-receiving beam pair 2 of a narrow beam of service; the base station transmits the message in a narrow beam mode;

step S1319: UE1 demodulates PDSCH resources in the receiving beam direction corresponding to the optimal transmitting-receiving narrow beam pair 2;

step S1320: UE2 demodulates PDSCH resources in the receive beam direction corresponding to the optimal transmit-receive narrow beam pair 2.

The above embodiment uses only 2 UEs in each beam as an illustration, and the combination situation of the UEs and the beams can be easily generalized to any scene containing more than 2 UEs and more than 2 beams in each beam.

According to the resource allocation method and the resource allocation device provided by the embodiment, the base station side sends synchronous broadcast information and PDCCH public information in a wide-beam mode, and the UE side performs wide-beam training to obtain an optimal wide-beam transmitting-receiving beam pair. Then, the base station side initiates a narrow beam refinement training request, and the UE side performs narrow beam training to obtain an optimal narrow beam transmitting-receiving beam pair. The base station performs resource allocation of PDCCH and PDSCH according to the result of narrow beam training, UE PDCCH resources on the same optimal transmitting beam are allocated on the same symbol in the control area, UE PDCCH resources on different optimal transmitting beams are allocated on different symbols in the control area, and the resource allocation of the downlink shared channel PDSCH takes the frequency resource on one symbol as the basic granularity, thereby being beneficial to realizing flexible scheduling of resources working in a beam mode.

Those of ordinary skill in the art will appreciate that all or a portion of the steps of the methods described above may be implemented by a program that instructs associated hardware, and the program may be stored on a computer readable storage medium such as a read-only memory, a magnetic or optical disk, etc. Alternatively, all or part of the steps of the above embodiments may be implemented using one or more integrated circuits, and accordingly, each module/unit in the above embodiments may be implemented in hardware or may be implemented in a software functional module. The present invention is not limited to any specific form of combination of hardware and software.

It is to be understood that various other embodiments of the present invention may be made by those skilled in the art without departing from the spirit and scope of the invention, and that various changes and modifications may be made in accordance with the invention without departing from the scope of the invention as defined in the following claims.

Claims

1. A resource allocation method applied to a base station, the method comprising:

transmitting PDCCH special control information to a user terminal in the direction of an optimal transmitting beam of an optimal transmitting-receiving narrow beam pair, wherein the PDCCH special control information carries information of PDSCH resources corresponding to the user terminal;

distributing Physical Downlink Control Channel (PDCCH) time-frequency resources for the user terminal according to a scheduling group where the user terminal is located, comprising:

2. The method of claim 1, wherein:

The allocating Physical Downlink Control Channel (PDCCH) time-frequency resources and Physical Downlink Shared Channel (PDSCH) time-frequency resources for the user terminal according to the scheduling group comprises the following steps:

3. The method of claim 1, further comprising, prior to partitioning the scheduling group for the user terminal:

4. A resource allocation method applied to a user terminal, the method comprising:

receiving the Physical Downlink Control Channel (PDCCH) special control information sent by a base station in the direction of the optimal receiving beam of the optimal transmitting-receiving narrow beam pair determined in the beam training stage, wherein the information carries the Physical Downlink Shared Channel (PDSCH) resource; wherein, the user terminals in the same scheduling group have the same optimal transmitting beam in the optimal transmitting-receiving narrow beam pair determined during beam training;

5. The method of claim 4, further comprising, prior to receiving PDCCH dedicated control information transmitted by a base station:

6. A resource allocation apparatus, applied to a base station, comprising:

an information sending module, configured to send PDCCH dedicated control information to a user terminal in a direction of an optimal transmit beam of an optimal transmit-receive narrow beam pair, where the PDCCH dedicated control information carries information of PDSCH resources corresponding to the user terminal;

7. The apparatus of claim 6, wherein:

the resource allocation module is configured to allocate, according to the scheduling group, a physical downlink control channel PDCCH time-frequency resource and a physical downlink shared channel PDSCH time-frequency resource to the user terminal, and includes:

8. The apparatus as recited in claim 6, further comprising:

9. A resource allocation apparatus, applied to a user terminal, comprising:

the information receiving module is used for receiving the special control information of the physical downlink control channel PDCCH sent by the base station in the direction of the optimal receiving beam of the optimal transmitting-receiving narrow beam pair determined in the beam training stage, wherein the special control information carries the information of the physical downlink shared channel PDSCH resource; wherein, the user terminals in the same scheduling group have the same optimal transmitting beam in the optimal transmitting-receiving narrow beam pair determined during beam training;

10. The apparatus as recited in claim 9, further comprising: