CN109219128B

CN109219128B - Communication method and device based on frame structure and frame structure

Info

Publication number: CN109219128B
Application number: CN201710539017.8A
Authority: CN
Inventors: 钱辰; 喻斌; 熊琦
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 2017-07-04
Filing date: 2017-07-04
Publication date: 2023-09-01
Anticipated expiration: 2037-07-04
Also published as: CN109219128A

Abstract

The invention discloses a communication method, a device and a frame structure based on the frame structure, wherein the frame structure comprises a control channel frequency band, an anchor sub-band and a data transmission frequency band, and the method comprises the following steps: detecting a synchronous signal block, performing downlink synchronous processing according to the detected synchronous signal block, and determining an anchor sub-band time-frequency resource; acquiring random access configuration information according to the anchor sub-band time-frequency resource, and performing a random access process according to the random access configuration information to complete uplink synchronization; control information in a control channel frequency band is acquired, and data communication is carried out with the base station in a data transmission frequency band according to the control information. According to the invention, through the communication method based on the frame structure, the advantages of traditional time division duplex and frequency division duplex are obtained, the scheduling flexibility can be greatly increased, and the utilization rate of the frequency spectrum is improved.

Description

Communication method and device based on frame structure and frame structure

Technical Field

The present invention relates to the field of wireless communications technologies, and in particular, to a communication method and apparatus based on a frame structure, and a frame structure.

Background

With the rapid development of the information industry, especially the growing demand from the mobile internet and internet of things (IoT, internet of things), the future mobile communication technology is challenged unprecedented. As can be expected from the international telecommunications union ITU report ITU-R m. the mobile traffic growth will grow approximately 1000 times compared to the 4G age, the number of user equipment connections will also exceed 170 billions, and the number of connected devices will be even more dramatic as the vast number of IoT devices gradually penetrate the mobile communication network. To address this unprecedented challenge, the communications industry and academia have developed a wide range of fifth generation mobile communication technology research (5G), oriented in the 2020 s. The framework and overall goals of future 5G have been discussed in ITU's report ITU-R m, where the requirements of 5G are expected, the application scenario and important performance metrics are specified. Aiming at the new demand in 5G, the report ITU-R M provides information related to the technical trend of 5G, and aims to solve the remarkable problems of remarkable improvement of system throughput, consistency of user experience, expansibility to support IoT, time delay, energy efficiency, cost, network flexibility, support of emerging services, flexible spectrum utilization and the like.

The duplex mode in wireless communication refers to the processing mode of uplink and downlink bidirectional data communication, is an important foundation of wireless communication Air interface (Air-interface) design, and is not exceptional in 5G research and development. Currently, frequency division duplexing (Frequency Division Duplex, FDD) and time division duplexing (Time Division Duplex, TDD) are two main duplexing modes, and are widely used in broadcast audio and video fields and civil communication systems, such as long term evolution (Long Term Evolution, LTE) systems, ieee802.11a/g wireless local area network (Wireless Local Area, WLAN) and the like, corresponding to Evolved Universal Terrestrial Radio Access (E-UTRA) protocols formulated by the third generation mobile communication partner project (3rd Generation Partnership Project,3GPP).

In the FDD mode, the uplink and the downlink communicate using paired frequency resources satisfying a certain duplex spacing (duplex spacing), while in the TDD mode, the uplink and the downlink share the same frequency resources, and the uplink communication and the downlink communication are divided by different time resources. The difference of duplex modes can lead to the difference of design of air interface physical layers such as frame structures and the like. Taking LTE as an example, two frame structures suitable for FDD mode and TDD mode are specified in LTE.

In the frame structure of FDD shown in fig. 1, one radio frame of 10ms consists of 10 subframes of duration 1ms, and each subframe consists of two slots of duration 0.5 ms. The uplink communication and the downlink communication are performed on different frequency resources.

The frame structure adopted in the TDD mode as shown in fig. 2 is similar to that of the FDD mode, and a radio frame of 10ms is composed of ten subframes with a duration of 1ms, except that uplink communication and downlink communication share the same frequency resource in the TDD mode, and are distinguished by time resources. E.g., the configuration in fig. 2, subframes 0, 5 are used for downstream communication and subframes 2, 3, 4, 7, 8, 9 are used for upstream communication. To ensure that downlink communication does not affect uplink communication, the frame structure of TDD mode introduces special subframes, namely subframes 1 and 6 in fig. 2. The special subframe consists of three domains, namely a downlink pilot time slot (Downlink Pilot Time Slot, dwPTS), a Guard Period (GP) and an uplink pilot time slot (Uplink Pilot Time Slot, upPTS). In the frame structure of the TDD mode, subframes 1, 5 and DwPTS are used for downlink transmission, while UpPTS and subsequent subframes are used for uplink transmission, GP is a guard interval between downlink communication and uplink communication, so as to ensure that uplink data communication is not affected by downlink communication. The TDD mode in LTE can be flexibly configured to support traffic with asymmetric uplink and downlink data communications. Table 1 shows various configurations of TDD mode in LTE, where D represents the subframe for downlink communication, U represents the subframe for uplink communication, and S represents a special subframe.

Table 1: TDD mode uplink and downlink configuration in LTE

The two duplex modes have advantages and disadvantages, specifically: the FDD mode is required to finish uplink and downlink data communication in paired frequency bands, uplink and downlink frequency pairing is required to meet a certain duplex interval, when 5G is developed to high frequency and large bandwidth, spectrum fragments are easily caused to be unfavorable for spectrum management from the perspective of spectrum division, and the TDD mode is used for finishing uplink and downlink data communication by using the same frequency band, so that the TDD mode has the advantage in the aspect of flexibility of frequency resource use, can support asymmetric services more, and has higher spectrum use efficiency; the FDD is paired spectrum, so that uplink and downlink resources are always available, and the scheduling and terminal feedback uplink control signaling can be timely, such as acknowledgement messages (ACK/NACK (acknowledgement/Non-acknowledgement) and channel state information (CSI, channel state information) of a hybrid automatic repeat request (Hybrid Automatic Retransmission Request, HARQ), so that feedback delay of an air interface can be reduced, scheduling efficiency is improved, and related design is complex due to different uplink and downlink time slot configurations of TDD; in addition, the TDD mode has the advantage of uplink and downlink channel reciprocity (channel reciprocity), and can greatly simplify CSI acquisition.

In 5G, a large-scale MIMO technique may be adopted to further improve the spectrum efficiency, and the base station side is equipped with a large number of antennas, so that a large amount of resources are required for downlink physical channel training and feedback of channel state information in FDD mode, and by utilizing channel reciprocity in TDD mode, the overhead of training and feedback can be significantly reduced, so that TDD mode is more attractive for large-scale MIMO technique; however, there is also a low latency requirement in 5G, which requires further shortening of the air interface transmission time interval (Transmission Time Interval, TTI) and more timely control signaling, which may lead to more complex design of TDD mode.

From the above analysis, the FDD mode and TDD mode have advantages and disadvantages, and in the face of richer application scenarios and use of new frequency bands in 5G, it is necessary to design a new duplex mode, and combine the advantages of FDD mode and TDD mode, so as to better ensure the spectrum utilization rate of 5G and the performance of the network.

Because the duplex mode in LTE is not flexible enough, the FDD mode needs paired spectrum, and the TDD mode is complicated in scheduling and HARQ process, if the existing duplex mode is still used, the spectrum efficiency and performance of the system cannot be further improved.

Disclosure of Invention

The invention provides a communication method, a device and a frame structure based on a frame structure, which can greatly increase the scheduling flexibility and improve the utilization rate of a frequency spectrum when the advantages of traditional time division duplex and frequency division duplex are obtained.

The invention provides a communication method based on a frame structure, wherein the frame structure comprises a control channel frequency band, an anchor sub-band and a data transmission frequency band, and the method comprises the following steps:

detecting a synchronous signal block, performing downlink synchronous processing according to the detected synchronous signal block, and determining an anchor sub-band time-frequency resource;

acquiring random access configuration information according to the anchor sub-band time-frequency resource, and performing a random access process according to the random access configuration information to complete uplink synchronization;

control information in a control channel frequency band is acquired, and data communication is carried out with the base station in a data transmission frequency band according to the control information.

Preferably, the acquiring random access configuration information according to the anchor subband time-frequency resource includes: :

detecting a system information block on the anchoring sub-band after detecting a first preset time interval of the synchronous signal block;

and acquiring the random access configuration information carried in the detected system information block.

determining the position of an anchor sub-band according to a downlink synchronization processing result, and acquiring a main information block carried by a broadcast channel in the synchronization signal block;

acquiring random access configuration information carried in the main information block; or determining a system information block according to the main information block, and acquiring random access configuration information carried in the system information block.

Preferably, the determining a system information block according to the main information block includes:

and detecting the system information block on the anchoring sub-band after a first preset time interval.

acquiring a delay or time domain index of a system information block indicated in the main information block;

determining the time-frequency resource position of the system information block according to the delay or the time-domain index;

and determining a system information block in the anchoring sub-band according to the time-frequency resource position.

Preferably, the system information block is transmitted within an anchor subband or data transmission band.

Preferably, the performing a random access procedure according to the random access configuration information includes:

Transmitting a random access preamble sequence to a base station through an uplink anchoring sub-band according to the random access configuration information;

detecting a random access response on the downlink anchor subband;

if the random access response is detected, sending a message 3 on an uplink anchoring sub-band;

a collision resolution response is detected on the downlink anchor subband.

detecting control information of an uplink anchoring sub-band used for transmitting a random access preamble sequence in a downlink control channel, and detecting and decoding a random access response in a downlink data transmission frequency band indicated by the control information;

if a random access response containing a preamble identifier matching the transmitted random access preamble is detected, transmitting a message 3 in an uplink data transmission band;

a collision resolution response is detected on the downstream data transmission band.

Preferably, the acquiring control information in a control channel band and performing data communication with the base station in a data transmission band according to the control information includes:

Detecting in a downlink control channel, and when downlink control information sent to the mobile terminal is detected, receiving downlink data in a corresponding downlink data transmission frequency band according to a resource allocation instruction carried in the downlink control information;

and sending a scheduling request in an uplink control channel, detecting in the downlink control channel after a second preset time interval, and when downlink control information sent to the user is detected, distributing uplink data in a corresponding uplink data transmission frequency band according to an uplink resource distribution instruction carried in the downlink control information.

Preferably, the frame structure further comprises a guard band and/or guard time, the method further comprising:

and acquiring a configuration index of a guard band and/or guard time sent by the base station, and setting according to the configuration index to provide protection when the base station is in data communication.

The invention also provides a communication method based on a frame structure, wherein the frame structure comprises an anchor sub-band and a data transmission band, and the method comprises the following steps:

according to the random access configuration information sent by the terminal through the anchoring sub-band, carrying out a random access process with the terminal;

and carrying out data communication with the terminal in a data transmission frequency band.

Preferably, the performing a random access procedure with the terminal according to random access configuration information sent by the terminal through an anchor subband includes:

the method comprises the steps that a receiving terminal sends random access configuration information carrying a random access preamble sequence through an uplink anchor sub-band;

performing random access processing according to the random access preamble sequence, and sending a random access response;

detecting message 3 on the uplink anchor subband;

a collision resolution response is sent on the downlink anchor sub-band.

performing random access processing according to the random access preamble sequence, transmitting control information of an uplink anchoring sub-band used by the random access preamble sequence in a downlink control channel, and transmitting a random access response in a downlink data transmission frequency band;

detecting the message 3 in the uplink data transmission band;

a collision resolution response is sent on the downstream data transmission band.

Preferably, the data communication with the terminal in the data transmission frequency band includes:

Transmitting downlink control information in a downlink control channel, so that the terminal detects the downlink control information in the downlink control channel;

and receiving a scheduling request in an uplink control channel, and transmitting downlink control information in a downlink control channel, so that the terminal detects the downlink control information in the downlink control channel.

and sending configuration indexes of the guard band and/or the guard time so that the terminal provides protection when data communication is carried out according to the configuration indexes.

The invention also provides a communication device based on a frame structure, which is applied with the frame structure comprising a control channel frequency band, an anchor sub-band and a data transmission frequency band, and the device comprises:

the downlink processing unit is used for detecting a synchronous signal block, carrying out downlink synchronous processing according to the detected synchronous signal block and determining an anchor sub-band time-frequency resource;

the uplink processing unit is used for acquiring random access configuration information according to the time-frequency resource of the anchor sub-band, and carrying out a random access process according to the random access configuration information to complete uplink synchronization;

And the communication unit is used for acquiring the control information in the control channel frequency band and carrying out data communication with the base station in the data transmission frequency band.

The invention also provides a communication device based on a frame structure, which is applied with the frame structure comprising an anchor subband and a data transmission band, and the device comprises:

an uplink processing unit, configured to perform a random access procedure with the terminal according to random access configuration information sent by the terminal through the anchor subband;

and the communication unit is used for carrying out data communication with the terminal in a data transmission frequency band.

The invention provides a frame structure which is applied to the communication method based on the frame structure, wherein the frame structure comprises three frequency bands, namely a control channel frequency band, an anchor sub-band and a data transmission frequency band;

the anchoring sub-band comprises downlink transmission content carrying synchronous information blocks and/or uplink transmission content carrying random access configuration information;

the control channel frequency band is used for transmitting an uplink control channel and/or a downlink control channel;

the data transmission frequency band is used for transmitting uplink data and/or downlink data.

Preferably, the frame structure further includes guard bands and/or guard times disposed between the bands to separate adjacent bands to provide protection when communicating data.

Compared with the prior art, the invention has at least the following advantages:

according to the invention, through the communication method based on the frame structure, the advantages of traditional time division duplex and frequency division duplex are obtained, the scheduling flexibility can be greatly increased, and the utilization rate of the frequency spectrum is improved.

Drawings

Fig. 1 is a schematic diagram of an FDD frame structure in the prior art;

fig. 2 is a schematic diagram of a TDD frame structure in the prior art;

FIG. 3 is a frame structure provided by the present invention;

fig. 4 is a flowchart of a communication method based on a frame structure at a terminal side provided by the present invention;

fig. 5 is a flowchart of a communication method based on a frame structure at a base station side provided by the present invention;

fig. 6 is a schematic diagram of a channel structure used in the first embodiment of the present invention;

fig. 7a is a schematic diagram of a transmission manner of a system information block according to the present invention;

fig. 7b is a schematic diagram of another transmission method of a system information block according to the present invention;

FIG. 8 is a schematic diagram of a control channel provided by the present invention;

FIG. 9 is a schematic illustration of an anchoring subband structure provided by the present invention;

fig. 10 is a schematic diagram of an uplink data communication flow provided by the present invention;

fig. 11 is a schematic diagram of division of uplink and downlink data transmission opportunities provided by the present invention;

Fig. 12 is a schematic diagram of a channel structure according to a third embodiment of the present invention;

fig. 13 is a schematic diagram of another channel structure according to the third embodiment of the present invention;

fig. 14 is a schematic structural diagram of a communication device based on a frame structure at a terminal side provided by the present invention;

fig. 15 is a schematic structural diagram of a communication device based on a frame structure at a base station side provided by the present invention.

Detailed Description

The invention provides a communication method and device based on a frame structure and the frame structure, and a detailed description of a specific embodiment of the invention is provided below with reference to the accompanying drawings.

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. The term "and/or" as used herein includes all or any element and all combination of one or more of the associated listed items.

It will be understood by those skilled in the art that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs unless defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The invention provides a communication method based on a frame structure, which comprises the following steps: :

step one: downlink synchronous processing; the terminal completes downlink synchronization through a downlink synchronization process, acquires system bandwidth and bandwidth structure by reading a downlink transmission part of the anchor sub-band, and further determines the position and time structure of the anchor sub-band, the position of an uplink control channel, the position of a downlink control channel, the bandwidth of a guard band and other information.

Step two: uplink random access; and the terminal sends the preamble sequence through an uplink transmission part in the anchor sub-band to finish the random access process.

Step three: after the access process is completed, the terminal performs communication with the base station on the corresponding frequency band.

In the above communication method, a frame structure as shown in fig. 3 is employed, which is composed of four frequency bands:

control channel bands near the band edges;

an anchor subband in the center of the band;

a data transmission band;

guard bands.

Wherein the transmission content in the anchor sub-band in the center of the band is fixed. The transmission content comprises downlink transmission content which is necessary for access systems such as downlink synchronous signals, downlink broadcast channels and the like, and uplink transmission content which is necessary for access systems such as random access channels and the like.

The control channel frequency band transmits the uplink control channel and the downlink control channel in a frequency division or time division mode.

The data transmission band transmits uplink/downlink data in a frequency division or time division or Multi-carrier division multiplexing (Multi-carrier Division Duplexing, MDD) or the like.

Meanwhile, guard bands and/or guard time are/is inserted between adjacent frequency bands, so that low interference between the adjacent frequency bands is ensured, and the reliability of data transmission on a control channel and an anchor sub-band is ensured.

Based on the above communication method and the frame structure in fig. 3, the communication method based on the frame structure provided by the present invention is specifically described with the terminal side and the base station side as main bodies respectively.

As shown in fig. 4, the method for frame structure-based communication provided by the present invention includes the following steps:

Step 401, detecting a synchronization signal block, and determining an anchor subband time-frequency resource according to downlink synchronization processing performed by the detected synchronization signal block and a base station.

Step 402, acquiring random access configuration information according to the anchor subband time-frequency resource, and performing a random access process according to the random access configuration information to complete uplink synchronization.

In this step, the acquiring random access configuration information according to the anchor subband time-frequency resource includes:

Or alternatively, the first and second heat exchangers may be,

the obtaining random access configuration information according to the anchor subband time-frequency resource may further include:

and acquiring random access configuration information carried in the main information block.

Or alternatively, the first and second heat exchangers may be,

And determining a system information block according to the main information block, and acquiring random access configuration information carried in the system information block.

The determining a system information block according to the main information block in the above steps may include:

acquiring a time domain index of a system information block indicated in the main information block;

determining the time-frequency resource position of the system information block according to the time-domain index;

Wherein the system information block is transmitted in an anchor subband or data transmission band.

In this step, the performing a random access procedure according to the random access configuration information includes:

a collision resolution response is detected on the downlink anchor subband.

Or alternatively, the first and second heat exchangers may be,

the random access process according to the random access configuration information comprises the following steps:

Step 403, obtaining control information in a control channel band, and performing data communication with the base station in a data transmission band.

In the step, the control information in a control channel frequency band is obtained, and data communication is carried out with the base station in a data transmission frequency band according to the control information, wherein the data communication comprises an uplink data communication part and a downlink data communication part; wherein, the liquid crystal display device comprises a liquid crystal display device,

Wherein the method further comprises:

and acquiring a configuration index of a guard band and/or guard time sent by the base station, and setting according to the configuration index to provide protection when data communication is carried out with the base station.

The invention also provides a communication method based on the frame structure, as shown in fig. 5, the method comprises the following steps:

step 501, performing a random access procedure with the terminal according to the random access configuration information sent by the terminal through the anchor sub-band.

The random access process is performed with the terminal according to the random access configuration information sent by the terminal through the anchor sub-band, and the method comprises the following steps:

detecting message 3 on the uplink anchor subband;

a collision resolution response is sent on the downlink anchor sub-band.

Or alternatively, the first and second heat exchangers may be,

detecting the message 3 in the uplink data transmission band;

And step 502, carrying out data communication with the terminal in a data transmission frequency band.

The step of carrying out data communication with the terminal in a data transmission frequency band comprises two parts of uplink data communication and downlink data communication; wherein, the liquid crystal display device comprises a liquid crystal display device,

Wherein the method further comprises:

The invention also provides a frame structure which is applied to the communication method based on the frame structure, wherein the frame structure comprises three frequency bands, namely a control channel frequency band, an anchor sub-band and a data transmission frequency band;

As for the frame structure-based communication method provided by the present invention, three specific embodiments are described below.

Example 1

In this embodiment, a communication method based on a frame structure will be described with reference to a specific system, and the channel frame structure adopted in this embodiment is shown in fig. 6, and is a composition of one radio frame. In this embodiment, one radio frame is composed of a plurality of subframes, each of which is composed of a plurality of symbols, and one symbol includes a plurality of subcarriers, which are functionally divided into different subbands. In fig. 6, these subbands are functionally divided into: control channel 1 and control channel 2 located at the edge of the frequency band represent uplink control channel and downlink control channel, or downlink control channel and uplink control channel, respectively; an anchor sub-band located at the center of the frequency band for transmitting uplink and downlink data necessary for the access system; a data channel between the control channel and the anchor sub-band for transmitting uplink data and downlink data; guard bands located between the respective sub-bands.

The anchoring sub-band uses sub-frame or sub-frame group formed by several sub-frames as unit to make conversion between downlink channel and uplink channel. The downlink channel in the anchor subband is used for transmitting broadcast channels, synchronization signals, etc., e.g., synchronization signal blocks comprising primary synchronization signals (Primary Synchronization Signal, PSS), secondary synchronization signals (Secondary Synchronization Signal, SSS), and broadcast channels. The uplink channel in the anchor subband is used for transmitting random access channels, etc. One possible way is that the anchor subband fixing some subframes is dedicated to transmitting a downlink synchronization signal block. Taking an example that one radio frame includes 7 subframes (each of which is named as subframe 0 to subframe 6, respectively), subframe 0 is fixed for transmitting a downlink anchor subband, or subframes 0 and 4 are fixed for transmitting a downlink anchor subband, and the anchor subbands of the remaining subframes are determined according to the configuration. A simple example is to inform the transmission direction of the remaining subframes within the broadcast channel.

The control channel is located at the edge of the frequency band, one side is a downlink control channel, and the other side is an uplink control channel. In a frequency hopping manner, downlink/uplink control channels alternately appear at the edges of the frequency band. For example, the downlink control channel of the even index subframe is at the upper edge of the frequency band, and the uplink control channel is at the lower edge of the frequency band; and the downlink control channels of the odd index subframes are at the lower edge of the frequency band, and the uplink control channels are at the upper edge of the frequency band. The frequency hopping pattern, i.e., the position of the uplink/downlink control channel in the frequency band, is configured by higher layer signaling or notified by the downlink control channel.

The data channel is positioned between the anchor sub-band and the control channel, and uplink data transmission and downlink data transmission are distinguished by adopting time division or sub-band frequency division for dividing uplink and downlink; or the division of subcarrier level is adopted to distinguish the uplink data and the downlink data transmission.

And a guard band is added between different channels to prevent adjacent inter-band interference or uplink and downlink crosstalk. And adding protection time between uplink and downlink conversion in the same sub-band for protecting uplink and downlink switching.

The flow of the terminal access network and data communication is as follows:

1. and the terminal performs downlink synchronization. I.e. the terminal detects the synchronization signal block by means of blind detection. After the terminal detects the synchronous signal block, the time and frequency domain synchronization is completed, and the position of the anchor sub-band can be determined. The terminal reads the main information block from the broadcast channel. The information read from the main information block should include the system bandwidth and the time-frequency resource location of the system information block. The terminal reads other information needed by access from the system information block indicated by the main information block, wherein the other information comprises the transmission time position of the uplink part of the anchoring sub-band, the random access channel configuration information, the random access preamble sequence resource pool configuration information and the bandwidth instant frequency resource position of each sub-band.

It should be noted that, the system information block indicated by the main information block may be placed on the downlink anchor subband, for example, delayed from the synchronization signal block by a fixed time sequence. In this case, the time-frequency position of the system information block does not need to be indicated in the main information block, and the terminal detects the system information block on the downlink anchor sub-band after detecting the synchronization signal block for a fixed or preset time; or only notifying the delay or time domain index of the system information block to the synchronous signal block in the main information block, and determining the position of the system information block according to the delay or time domain index by the terminal.

In another manner, a system information block indicated by a main information block is placed in a data channel, where the main information block needs to indicate a time-frequency resource location of the system information block. And after the terminal reads the main information block, reading the time-frequency resource position of the system information block, and reading the system information block at the time-frequency resource position. Both of the above modes are shown in fig. 7a and 7 b.

The terminal determines the position, bandwidth and bandwidth of the guard band of each sub-band through the content in the system information block. One possible way is to inform the system information block of the control channel bandwidth at the edge of the band and the switching point of the downlink/uplink control channel in the radio frame/sub-frame. For example, the terminal obtains the number of physical resource blocks in the system through the system bandwidth in the main information block; the terminal obtains the number of physical resource blocks required by the downlink/uplink control channel through the bandwidth of the downlink/uplink control channel; and the terminal obtains the time-frequency structure of the control sub-band positioned at the edge of the frequency band through the conversion point information.

One simple example is as follows: it is assumed that a control sub-band of a first sub-frame of a radio frame located at an upper edge of a frequency band transmits a downlink control channel, a control sub-band of a first sub-frame of a radio frame located at a lower edge of the frequency band transmits an uplink control channel, and one radio frame is composed of 7 sub-frames, each sub-frame being composed of 14 symbols. And assuming that one symbol of conversion time is required for the downstream and upstream conversion. The number of physical resource blocks occupied by the control sub-band can be obtained to be 3 through the information in the system information block, and the number of switching points of the downlink/uplink control channel in the wireless frame is 1. The control channels at the band edge are as shown in fig. 8. Another possible way is to preset several possible uplink and downlink configurations of the control channel in the form of an index table, and notify the corresponding uplink and downlink configurations of the control channel in the system information block.

Likewise, the terminal determines the uplink and downlink subband distribution on the anchor subband through the content in the system information block. For example, by informing a radio frame or a switching point in a subframe, or by fixing an uplink and downlink configuration notification index in advance. Alternatively, the uplink and downlink configuration in the anchor subband may be the same as the control subband at the upper edge of the band or the control subband at the lower edge of the band. In this case, the uplink/downlink configuration of the control subband only needs to be notified.

2. And the terminal performs a random access process. And after the terminal determines the frame structure and reads the random access channel configuration information and the preamble sequence resource pool information, the terminal performs a random access process.

The random access procedure is performed in two ways:

a. the random access procedure is only performed on the anchor subband. Specifically, the terminal transmits a preamble sequence on a random access channel located on an uplink anchor subband. And then detecting random access response at the designated position on the downlink anchor sub-band. If the random access response detection is successful, a message 3 is sent to the appointed position on the uplink anchoring sub-band, and finally the conflict resolution message is detected at the appointed position of the downlink anchoring sub-band.

Specifically, as shown in fig. 9, the anchoring subband structure is composed of an uplink time slot and a downlink time slot. Wherein, the downlink time slot comprises a synchronous signal block and a downlink data transmission part; the uplink time slot includes a random access channel and an uplink data transmission portion. Each downlink slot may be composed of a plurality of synchronization signal blocks and a plurality of downlink data transmission parts for transmitting random access responses and collision resolution messages. Each uplink slot may contain a plurality of random access channels and a plurality of uplink data transmission portions for transmitting the message 3.

To facilitate detection of random access responses, a common downlink control channel is added to the downlink data transmission portion for indicating whether a subsequent downlink data transmission portion has a corresponding random access response. One possible way is to transmit the common downlink control channel at a fixed location (e.g., the first 1-3 symbols) in each subframe of the downlink data transmission portion.

b. The random access procedure may be performed on subbands other than the anchor subband. In this configuration, the random access preamble sequence is still transmitted on the uplink anchor subband, but the remaining steps may be performed on other subbands than the anchor subband.

Specifically, after the terminal completes the transmission of the preamble sequence, it detects a random access response on a fixed or predetermined/configured slot. If control information scrambled by RA-RNTI (Routing Area-Radio Network Tempory Identity) using a random access channel used for transmitting a preamble sequence is detected in a downlink control channel, the random access response detection is decoded in a downlink data transmission band indicated by the control information. If a random access response including a preamble identifier matching the transmitted preamble is detected, a message 3 is transmitted in the corresponding uplink data transmission band based on uplink resource allocation information indicated in the random access response. And finally detecting the transmission of the conflict resolution message on the downlink data channel.

In this way, the control sub-band and the data transmission band are used in the random access procedure. Considering the random access response, both message 3 and the collision resolution message are based on scheduled data transmissions, so that the spectrum utilization in this manner is more efficient from the initial access point of view.

The flow of downstream data communication is as follows:

and the terminal performs blind detection in the downlink control channel, and if the downlink control information sent to the terminal is detected, the terminal receives downlink data in a corresponding downlink data transmission frequency band according to the resource allocation instruction contained in the downlink control information.

The flow of uplink data communication is as follows:

the terminal sends scheduling request information on an uplink control channel; after the terminal sends the scheduling request, it detects whether there is downlink control information sent to the terminal in the downlink control channel after a fixed or predetermined time. If the corresponding downlink control information is detected, uplink data is allocated in the corresponding uplink data transmission band according to the uplink resource allocation information contained in the downlink control information, and the uplink data communication flow is shown in fig. 10.

In this embodiment, the sub-frames are used as time units. In practical systems, time slots, mini-slots, or symbols may be used instead of subframes as described above as the time units of the frame structure and data communication flow in the embodiments.

In addition, in the data transmission band, the control sub-band, and the anchor sub-band, the reference signal is inserted to estimate the effective channel for transmitting the uplink data and the downlink data.

Example two

In this embodiment, a communication method based on a frame structure will be described in connection with a specific system, and a channel structure adopted in this embodiment is shown in fig. 6.

In this embodiment, the data sub-band is divided into a plurality of transmission opportunities by combining sub-band level frequency division multiplexing and time division multiplexing, and is used for transmitting downlink and uplink data.

As shown in fig. 11, a simple example is that a time unit group consisting of a plurality of subframes/slots/mini-slots/symbols in the time domain and a plurality of physical resource blocks in the frequency domain compose different transmission opportunities for transmitting uplink or downlink data. The guard interval needs to be reserved between different transmission directions in the frequency domain, and the guard time needs to be reserved between different transmission directions in the time domain, so that the residual critical band interference and inter-symbol interference in the frequency domain and the time domain are ensured to be smaller.

When the resource scheduling is carried out, the resource allocation is carried out in the following mode: the resource allocation in the frequency domain is done by informing the frequency domain physical resource block index. For example, one possible way is to allocate frequency domain resources by using a bit map. The allocation of resources in the time domain is done by informing about the allocated time cell index. For example, allocation of time domain resources is accomplished by informing the subframe index.

When the scheme provided by the embodiment is adopted, the conversion of the uplink and downlink transmission directions exists in both the time domain and the frequency domain. In order to avoid interference between links, a guard band is required to be inserted when the transmission directions of the uplink data and the downlink data in the frequency domain are converted; meanwhile, the protection time is needed to be inserted when the time domain uplink data and the time domain downlink data are converted in the sending direction. For the frame structure provided in this embodiment, the insertion of the guard band and the guard time may be completed in a scheduled manner. If the guard band is based on physical resource blocks, i.e. the guard band is 1 or more physical resource blocks, the base station may make some physical resource blocks not scheduled into the guard band by not scheduling them. Similarly, for time domain resources, some subframes/slots/mini-slots/symbols may also be unscheduled to make these unscheduled time units guard times.

Another way to insert guard bands and guard times is to insert guard bands and guard times in a configured manner. For example, the number of subcarriers used for the guard band at the band edge position of the allocated time-frequency resource is defined in a predetermined manner for the guard band. Or the number of sub-carriers which are reserved as the guard band is needed to be reserved in advance for configuring various edge physical resource blocks, and the terminal is notified through the downlink control channel or the configuration of high-layer signaling in the form of an index. A simple example is the configuration of the number of guard band subcarriers by a configuration table as shown in table 2.

Table 2: guard band reserved subcarrier number configuration

According to the configuration table shown in table 2, the base station simultaneously notifies the index of the band edge for the relative number of subcarriers for the guard band when allocating resources. And the terminal performs code rate adaptation according to the number of the reserved subcarriers and performs data transmission.

For the guard time, a predetermined number of symbols/slots/mini-slots may be reserved as the guard time at the end of the allocated time resource by a predetermined method. Another possible way is to inform the guard time in the form of an index by means of a preconfigured index table comprising several reserved time units, one possible way being shown in table 3.

Table 3: configuration of number of reserved time units of protection time

Index	Number of reserved time units
		0	1
1	2
		2	3
…	…

In the example shown in table 3 above, the time units may be symbols/slots/mini-slots, etc. The index informs the terminal together with the resource configuration information through the downlink control channel, or informs the terminal in a semi-static mode through a high-layer signaling configuration mode. After the terminal acquires the information of the number of the reserved time units, rate adaptation is carried out on the transmitted information according to the information, and the terminal transmits the information on the appointed time-frequency resource.

Example III

In this embodiment, a communication method based on a frame structure will be described in connection with a specific system. In the present embodiment, the position of the anchor sub-band may not be limited to the center of the entire frequency band. Instead, the anchor subband may be located near the control subband at the band edge.

One possible channel structure is shown in fig. 12, in which the control subbands remain at the band edges while the anchor subbands are placed near one side of the control subbands and ensure that the downlink anchor subbands are adjacent to the downlink control channel and the uplink anchor subbands are adjacent to the uplink control channel. The remaining portion of the time-frequency resources are used to transmit the data transmission band. The example shown in fig. 12 is an extreme example among others.

In other possible configurations, the anchor subband is not located in the middle of the band, as shown in fig. 13.

For the channel structure shown in this embodiment, the communication flow between the terminal and the base station also needs to be adjusted accordingly. Specifically, in the initial access process, the terminal performs initial access through a synchronization signal block in a downlink anchoring sub-band, completes the downlink synchronization process, reads system bandwidth information from a main information block in a broadcast channel in a corresponding synchronization signal block, and reads the position of the anchoring sub-band in a system band from the main information block or a system information block indicated by the main information block.

One possible way is to transmit an offset of the anchoring subband center with respect to the center frequency in the main information block or in a system information block indicated by the main information block, which offset can be characterized by the number of physical resource blocks. Meanwhile, the sign (positive or negative) of the offset represents the offset direction of the anchor subband with respect to the center frequency. The notification may be by way of an index table.

Another possibility is to transmit an index of the first physical resource block of the anchor subband in the main information block or in a system information block indicated by the main information block, for indicating the position of the anchor subband in the whole system bandwidth.

The terminal acquires the frequency domain position of the anchor sub-band through downlink synchronization, and reads the offset of the anchor sub-band relative to the center frequency from the main information block or the system information block indicated by the main information block, thereby determining the position of the whole system bandwidth. And determining the structure of the whole system bandwidth by combining the notification of the system bandwidth structure in the main information block or the system information block.

In the scheme provided in this embodiment, the rest of the communication flows including the random access procedure and the uplink/downlink data communication steps may be the schemes provided in the first and second embodiments, and therefore will not be described herein.

Based on the above-mentioned communication method based on the frame structure provided by the present invention, the present invention also correspondingly provides a communication device based on the frame structure, as shown in fig. 14, the device includes:

a downlink processing unit 1401, configured to detect a synchronization signal block, perform downlink synchronization processing with a base station according to the detected synchronization signal block, and determine an anchor subband time-frequency resource;

an uplink processing unit 1402, configured to obtain random access configuration information according to the anchor subband time-frequency resource, perform a random access procedure according to the random access configuration information, and complete uplink synchronization;

a communication unit 1403 is configured to acquire control information in a control channel band and perform data communication with the base station in a data transmission band.

Preferably, the uplink processing unit 1402 is configured to detect the system information block on the anchor subband after a first preset time interval; and acquiring the random access configuration information carried in the detected system information block. Or alternatively, the first and second heat exchangers may be,

the uplink processing unit 1402 is further configured to determine a position of the anchor subband according to a downlink synchronization processing result, and obtain a main information block carried by a broadcast channel in the synchronization signal block; and acquiring random access configuration information carried in the main information block. Or alternatively, the first and second heat exchangers may be,

The uplink processing unit 1402 is further configured to determine a position of the anchor subband according to a downlink synchronization processing result, and obtain a main information block carried by a broadcast channel in the synchronization signal block; and determining a system information block according to the main information block, and acquiring random access configuration information carried in the system information block.

Preferably, the uplink processing unit 1402 is specifically configured to obtain a time domain index of a system information block indicated in the main information block; determining the time-frequency resource position of the system information block according to the time-domain index; and determining a system information block in the anchoring sub-band according to the time-frequency resource position.

Preferably, the uplink processing unit 1402 is configured to send a random access preamble sequence to a base station through an uplink anchor subband according to the random access configuration information; detecting a random access response on the downlink anchor subband; if the random access response is detected, sending a message 3 on an uplink anchoring sub-band; detecting a collision resolution response on the downlink anchor subband; or alternatively, the first and second heat exchangers may be,

the uplink processing unit 1402 is configured to send a random access preamble sequence to a base station through an uplink anchor subband according to the random access configuration information; detecting control information of an uplink anchoring sub-band used for transmitting a random access preamble sequence in a downlink control channel, and detecting and decoding a random access response in a downlink data transmission frequency band indicated by the control information; if a random access response containing a preamble identifier matching the transmitted random access preamble is detected, transmitting a message 3 in an uplink data transmission band; a collision resolution response is detected on the downstream data transmission band.

Preferably, the communication unit 1403 is configured to detect in a downlink control channel, and when detecting downlink control information sent to itself, receive downlink data in a corresponding downlink data transmission band according to a resource allocation instruction carried in the downlink control information; and the method is also used for sending a scheduling request in the uplink control channel, detecting in the downlink control channel after a second preset time interval, and when the downlink control information sent to the device is detected, distributing uplink data in the corresponding uplink data transmission frequency band according to the uplink resource distribution instruction carried in the downlink control information.

A configuration unit 1404, configured to obtain a configuration index of a guard band and/or guard time sent by a base station, and set according to the configuration index, so as to provide protection when performing data communication with the base station.

The present invention also provides a communication device based on a frame structure, as shown in fig. 15, the device includes:

an uplink processing unit 1501, configured to perform a random access procedure with a terminal according to random access configuration information sent by the terminal through the anchor subband;

a communication unit 1502, configured to perform data communication with the terminal in a data transmission band.

Preferably, the method comprises the steps of,

the uplink processing unit 1501 is configured to receive random access configuration information carrying a random access preamble sequence sent by a terminal through an uplink anchor subband; performing random access processing according to the random access preamble sequence, and sending a random access response; detecting message 3 on the uplink anchor subband; transmitting a collision resolution response on the downlink anchor subband; or alternatively, the first and second heat exchangers may be,

the uplink processing unit 1501 is configured to receive random access configuration information carrying a random access preamble sequence sent by a terminal through an uplink anchor subband; performing random access processing according to the random access preamble sequence, transmitting control information of an uplink anchoring sub-band used by the random access preamble sequence in a downlink control channel, and transmitting a random access response in a downlink data transmission frequency band; detecting the message 3 in the uplink data transmission band; a collision resolution response is sent on the downstream data transmission band.

Preferably, the communication unit 1502 is configured to send downlink control information in a downlink control channel, so that the terminal detects the downlink control information in the downlink control channel; and the method is also used for receiving a scheduling request in an uplink control channel and sending downlink control information in a downlink control channel so that the terminal detects the downlink control information in the downlink control channel.

A transmitting unit 1503, configured to transmit a configuration index of a guard band and/or guard time, so that the terminal provides protection when performing data communication according to the configuration index.

The invention provides a frame structure based on a novel duplex mode. By adopting the frame structure based on the novel duplex mode, the invention can simultaneously obtain the advantages of the traditional time division duplex and the frequency division duplex, and greatly increases the scheduling flexibility. In particular, since the control channel exists at any time, the HARQ process will be greatly simplified and the scheduling delay will be reduced. Meanwhile, as paired frequency spectrums are not needed, the utilization rate of the frequency spectrums by the method provided by the invention is improved relative to frequency division duplex.

The scheme provided by the invention is more suitable for realizing a large-scale MIMO system, because the channel state information of the downlink can be obtained through the data transmission frequency band part which is time-divided in the time domain.

In a word, the scheme provided by the invention has more sufficient utilization ratio of the frequency spectrum than the traditional frequency division duplex and time division duplex, and combines the advantages of the two duplex modes.

It will be understood by those within the art that each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by computer program instructions. Those skilled in the art will appreciate that the computer program instructions can be implemented in a processor of a general purpose computer, special purpose computer, or other programmable data processing method, such that the blocks of the block diagrams and/or flowchart illustration are implemented by the processor of the computer or other programmable data processing method.

The modules of the device can be integrated into a whole or can be separately deployed. The modules can be combined into one module or further split into a plurality of sub-modules.

Those skilled in the art will appreciate that the drawing is merely a schematic representation of one preferred embodiment and that the modules or processes in the drawing are not necessarily required to practice the invention.

Those skilled in the art will appreciate that modules in an apparatus of an embodiment may be distributed in an apparatus of an embodiment as described in the embodiments, and that corresponding changes may be made in one or more apparatuses different from the present embodiment. The modules of the above embodiments may be combined into one module, or may be further split into a plurality of sub-modules.

The above-described inventive sequence numbers are merely for the purpose of description and do not represent the advantages or disadvantages of the embodiments.

The foregoing disclosure is merely illustrative of some embodiments of the present invention, and the present invention is not limited thereto, as modifications may be made by those skilled in the art without departing from the scope of the present invention.

Claims

1. A method performed by a user terminal in a wireless communication system, the method comprising:

detecting a synchronous signal block, and performing initial access based on the synchronous signal block;

Determining a location of an anchor subband based on a master information block or a system information block associated with the synchronization signal block, wherein the master information block or the system information block includes information related to the location of the anchor subband;

acquiring random access configuration information based on the position of the anchor sub-band;

detecting a random access response on the downlink anchor subband;

a collision resolution response is detected on the downlink anchor subband.

2. The method of claim 1, wherein determining the location of the anchor subband based on a master information block or a system information block associated with the synchronization signal block comprises at least one of:

the main information block or the system information block comprises an offset of the center of the anchor sub-band relative to the center frequency, and the position of the anchor sub-band is determined according to the offset of the center of the anchor sub-band relative to the center frequency;

and the main information block or the system information block comprises an index of the first physical resource block of the anchor sub-band, and the position of the anchor sub-band is determined according to the index of the first physical resource block of the anchor sub-band.

3. The method of claim 2, wherein the offset is a number of physical resource blocks.

4. The method of claim 2, wherein the offset is a signed offset, the sign of the offset representing a direction of offset of the anchor subband center relative to the center frequency.

5. The method of claim 1, wherein the obtaining random access configuration information based on the location of the anchor subband comprises:

6. The method according to any of claims 1-5, wherein the system information block is transmitted within an anchor subband or a data transmission band.

7. A method performed by a base station in a wireless communication system, the method comprising:

transmitting a synchronous signal block, wherein the synchronous signal block is used for the initial access of a user terminal;

transmitting random access configuration information based on the position of an anchor sub-band, and performing a random access process with a user terminal based on the random access configuration information, wherein a main information block or a system information block associated with the synchronous signal block comprises information related to the position of the anchor sub-band;

Wherein, the random access process is performed with the user terminal based on the random access configuration information, and the method comprises the following steps:

the receiving terminal sends a random access preamble sequence through an uplink anchoring sub-band based on the random access configuration information;

detecting message 3 on the uplink anchor subband;

a collision resolution response is sent on the downlink anchor sub-band.

8. The method of claim 7, wherein at least one of the master information block or the system information block comprises:

anchoring the offset of the center of the sub-band relative to the center frequency;

the anchor sub-band has an index of the first physical resource block.

9. The method of claim 8, wherein the offset is a number of physical resource blocks.

10. The method of claim 8, wherein the offset is a signed offset, the sign of the offset representing a direction of offset of the anchor subband center relative to the center frequency.

11. A user terminal comprising a transceiver and a processor coupled to the transceiver and configured to perform the method of any of claims 1-6.

12. A base station comprising a transceiver and a processor coupled to the transceiver and configured to perform the method of any of claims 7-10.

13. A computer readable storage medium, characterized in that the storage medium has stored therein a computer program which, when executed by a processor, implements the method of any one of claims 1 to 6 or implements the method of any one of claims 7-10.