CN110557239B

CN110557239B - Method and device for determining CRS (cell-specific reference signal) sequence

Info

Publication number: CN110557239B
Application number: CN201910814774.0A
Authority: CN
Inventors: 张晋瑜; 王化磊
Original assignee: Beijing Ziguang Zhanrui Communication Technology Co Ltd
Current assignee: Beijing Ziguang Zhanrui Communication Technology Co Ltd
Priority date: 2019-08-30
Filing date: 2019-08-30
Publication date: 2022-05-27
Anticipated expiration: 2039-08-30
Also published as: CN110557239A

Abstract

The present disclosure relates to the field of communications technologies, and in particular, to a method and an apparatus for determining a CRS sequence of a cell-specific reference signal. The method comprises the following steps: acquiring a Physical Cell Identity (PCI) of a target cell; and determining the CRS sequence according to the PCI, wherein the CRS sequence is irrelevant to time information or only relevant to partial information in the time information. According to the embodiment of the disclosure, the CRS sequence is simplified, so that the CRS sequence is not related to time information such as a time slot number and an OFDM symbol number any more, or the CRS sequence is related to only part of the time information, thereby reducing the complexity of blind detection of the CRS sequence by the terminal equipment under the condition that the time information is unknown.

Description

Method and device for determining CRS (cell-specific reference signal) sequence

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to a method and an apparatus for determining a Cell-specific Reference Signal (CRS) sequence.

Background

After the access network device modulates the codes of the cell public information and the like, the cell public information and the like are sent in a fixed period on a Physical Broadcast Channel (PBCH), and the terminal device has to access the cell to acquire the cell public information and other system information by analyzing the PBCH.

In Non-terrestrial network (NTN) systems, no Demodulation Reference Signal (DMRS) specific to the PBCH is designed, and instead, the PBCH is demodulated by using CRS multiplexed on a specific symbol. At present, after acquiring a Physical Cell Identity (PCI) of a target Cell, a terminal device cannot acquire time information such as a timeslot number and an Orthogonal Frequency Division Multiplexing (OFDM) symbol number, and therefore a computing device usually determines a CRS sequence through blind inspection according to the PCI.

However, in the above method, the terminal device can only determine the CRS sequence through multiple blind detections before decoding the PBCH, which results in a long time for acquiring the CRS sequence and increases the complexity of system implementation.

Disclosure of Invention

In view of this, the present disclosure provides a method and an apparatus for determining a CRS sequence. The technical scheme is as follows:

according to an aspect of the present disclosure, a method for determining a CRS sequence is provided, where the method is used in a terminal device, and the method includes:

obtaining the PCI of a target cell;

and determining the CRS sequence according to the PCI, wherein the CRS sequence is irrelevant to time information or only relevant to partial information in the time information.

In one possible implementation manner, part of the information in the time information includes:

a field indication; or,

the number of the OFDM symbol where the CRS is located; or,

the half frame indication and the OFDM symbol number where the CRS is located; or,

and the number of the time slot where the CRS is positioned.

In another possible implementation manner, the determining the CRS sequence according to the PCI includes:

determining initialization parameters of the CRS sequence according to the PCI, wherein the initialization parameters of the CRS sequence are irrelevant to the time information;

determining the CRS sequence based on initialization parameters of the CRS sequence.

In another possible implementation manner, the determining initialization parameters of the CRS sequence according to the PCI includes:

according to the PCI, determining an initialization parameter c of the CRS sequence by the following formula_init1：

c_init1＝(2¹⁰*X+n_ID)mod2³¹；

Wherein X is a fixed value or is a sum of n_IDA determined value; n is_IDThe PCI of the target cell.

and according to the PCI, determining the CRS sequence by blindly detecting partial information in the time information.

In another possible implementation manner, the determining, according to the PCI, the CRS sequence by blindly detecting partial information in the time information includes:

determining alternative initialization parameters corresponding to the CRS sequence according to the PCI and partial information in the time information;

and determining the CRS sequence based on the alternative initialization parameters corresponding to the CRS sequence.

In another possible implementation manner, the determining, according to the PCI and the partial information in the time information, an alternative initialization parameter corresponding to the CRS sequence includes:

and determining an alternative initialization parameter corresponding to the CRS sequence through a preset formula according to the PCI, the half frame indication and/or the OFDM symbol number of the CRS.

In another possible implementation manner, the determining, according to the PCI, the half frame indication, and/or the number of the OFDM symbol in which the CRS is located, the alternative initialization parameter corresponding to the CRS sequence by using a preset formula includes:

according to the PCI and the field indication, determining an alternative initialization parameter c corresponding to the CRS sequence through the following formula_init2：

Wherein, the

The total number of OFDM symbols included in a time slot; the c0 indicates the field, the c0 indicates a first value when the CRS transmission time is in the first field of a radio frame, and the c0 indicates a second value when the CRS transmission time is in the second field of the radio frameA value; the μ is used to indicate a subcarrier spacing; n is_IDThe PCI of the target cell.

determining an alternative initialization parameter c corresponding to the CRS sequence according to the PCI and the OFDM symbol number where the CRS is located by the following formula_init3：

c_init3＝(2¹⁰(l+1)(2n_ID+1)+n_ID)mod2³¹；

Wherein, the l is the OFDM symbol number where the CRS is located; n is_IDThe PCI of the target cell.

determining an alternative initialization parameter c corresponding to the CRS sequence according to the PCI, the half-frame indication and the OFDM symbol number where the CRS is located by the following formula_init4：

Wherein, the

The total number of OFDM symbols included in a time slot; the c0 indicates the field, the c0 indicates a first value when the CRS transmission time is in the first field of a wireless frame, and the c0 indicates a second value when the CRS transmission time is in the second field of the wireless frame; the μ is used to indicate a subcarrier spacing; the l is the OFDM symbol number where the CRS is located; n is_IDThe PCI of the target cell.

and determining alternative initialization parameters corresponding to the CRS sequence through a preset formula according to the PCI and the time slot number of the CRS.

In another possible implementation manner, the determining, according to the PCI and the timeslot number where the CRS is located, the alternative initialization parameter corresponding to the CRS sequence by using a preset formula includes:

determining an alternative initialization parameter c corresponding to the CRS sequence according to the PCI and the time slot number of the CRS_init5：

Wherein, the

The total number of OFDM symbols included in a time slot; the above-mentioned

Numbering the time slot in which the CRS is located; n is_IDThe PCI of the target cell.

determining an alternative initialization parameter c corresponding to the CRS sequence according to the PCI and the time slot number of the CRS_init6：

Wherein, the

The total number of OFDM symbols included in a time slot; the Y is a value obtained by taking a module of the time slot number where the CRS is located; n is_IDThe PCI of the target cell, the

The μ is used to indicate a subcarrier spacing for the slot number in which the CRS is located.

According to another aspect of the present disclosure, there is provided a method for determining a CRS sequence, for use in an access network device, the method including:

acquiring the stored PCI of the target cell;

a field indication; or,

the number of the OFDM symbol where the CRS is located; or,

and the number of the time slot where the CRS is positioned.

determining an initialization parameter of the CRS sequence according to the PCI, wherein the initialization parameter of the CRS sequence is irrelevant to time information;

c_init1＝(2¹⁰*X+n_ID)mod2³¹；

determining initialization parameters of the CRS sequence according to the PCI and partial information in the time information;

In another possible implementation manner, the determining initialization parameters of the CRS sequence according to the PCI and the partial information in the time information includes:

and determining initialization parameters of the CRS sequence according to the PCI, the half-frame indication and/or the OFDM symbol number where the CRS is located.

In another possible implementation manner, the determining initialization parameters of the CRS sequence according to the PCI, the half frame indication, and/or the OFDM symbol number where the CRS is located includes:

determining an initialization parameter c of the CRS sequence according to the PCI and the field indication by the following formula_init2：

Wherein, the

The total number of OFDM symbols included in a time slot; the c0 is the field indication, the c0 is a first value when the CRS transmission time is in the first field of a wireless frame, and the CRS transmission time is in the absenceC0 is a second value in the second half of the line frame; the μ is used to indicate a subcarrier spacing; n is_IDThe PCI of the target cell.

according to the PCI and the OFDM symbol number where the CRS is located, determining an initialization parameter c of the CRS sequence through the following formula_init3：

c_init3＝(2¹⁰(l+1)(2n_ID+1)+n_ID)mod2³¹；

according to the PCI, the half-frame indication and the OFDM symbol number where the CRS is located, determining an initialization parameter c of the CRS sequence through the following formula_init4：

Wherein, the

and determining initialization parameters of the CRS sequence according to the PCI and the time slot number of the CRS.

In another possible implementation manner, the determining initialization parameters of the CRS sequence according to the PCI and the slot number of the CRS includes:

according to the PCI and the time slot number of the CRS, determining an initialization parameter c of the CRS sequence through the following formula_init5：

Wherein, the

The total number of OFDM symbols included in a time slot; the above-mentioned

according to the PCI and the time slot number of the CRS, determining an initialization parameter c of the CRS sequence through the following formula_init6：

Wherein, the

The total number of OFDM symbols included in a time slot; the Y is a value obtained by taking a module of the time slot number where the CRS is located; n is said_IDThe PCI of the target cell, the

Numbering the slots in which the CRS is located, the μ to indicate a subcarrier spacing.

According to another aspect of the present disclosure, there is provided an apparatus for determining a CRS sequence, for use in a terminal device, the apparatus including:

the acquisition module is used for acquiring the PCI of the target cell;

a determining module, configured to determine the CRS sequence according to the PCI, where the CRS sequence is unrelated to time information or only related to part of the time information.

a field indication; or,

the number of the OFDM symbol where the CRS is located; or,

and the number of the time slot where the CRS is positioned.

In another possible implementation manner, the determining module is further configured to determine an initialization parameter of the CRS sequence according to the PCI, where the initialization parameter of the CRS sequence is unrelated to the time information; determining the CRS sequence based on initialization parameters of the CRS sequence.

In another possible implementation manner, the determining module is further configured to determine, according to the PCI, an initialization parameter c of the CRS sequence according to the following formula_init1：

c_init1＝(2¹⁰*X+n_ID)mod2³¹；

Wherein X is a fixed value or is a value derived fromn_IDA determined value; n is_IDThe PCI of the target cell.

In another possible implementation manner, the determining module is further configured to determine the CRS sequence by blindly detecting partial information in the time information according to the PCI.

In another possible implementation manner, the determining module is further configured to determine, according to the PCI and partial information in the time information, an alternative initialization parameter corresponding to the CRS sequence; and determining the CRS sequence based on the alternative initialization parameters corresponding to the CRS sequence.

In another possible implementation manner, the determining module is further configured to determine, according to the PCI, the half frame indication, and/or the number of the OFDM symbol in which the CRS is located, the candidate initialization parameter corresponding to the CRS sequence by using a preset formula.

In another possible implementation manner, the determining module is further configured to determine, according to the PCI and the field indication, an alternative initialization parameter c corresponding to the CRS sequence by using the following formula_init2：

Wherein, the

The total number of OFDM symbols included in a time slot; the c0 indicates the field, the c0 indicates a first value when the CRS transmission time is in the first field of a radio frame, and the c0 indicates a second value when the CRS transmission time is in the second field of the radio frame; the μ is used to indicate a subcarrier spacing; n is_IDThe PCI of the target cell.

In another possible implementation manner, the determining module is further configured to determine, according to the PCI and the OFDM symbol number where the CRS is located, an alternative initialization parameter c corresponding to the CRS sequence by using the following formula_init3：

c_init3＝(2¹⁰(l+1)(2n_ID+1)+n_ID)mod2³¹；

In another possible implementation manner, the determining module is further configured to determine, according to the PCI, the half-frame indication, and the OFDM symbol number where the CRS is located, an alternative initialization parameter c corresponding to the CRS sequence by using the following formula_init4：

Wherein, the

The total number of OFDM symbols included in a time slot; the c0 indicates the field, the c0 is a first value when the transmission time of the CRS is in the first field of a wireless frame, and the c0 is a second value when the transmission time of the CRS is in the second field of the wireless frame; the μ is used to indicate a subcarrier spacing; the l is the OFDM symbol number where the CRS is located; n is_IDThe PCI of the target cell.

In another possible implementation manner, the determining module is further configured to determine, according to the PCI and a timeslot number where the CRS is located, an alternative initialization parameter corresponding to the CRS sequence by using a preset formula.

In another possible implementation manner, the determining module is further configured to determine, according to the PCI and the timeslot number where the CRS is located, an alternative initialization parameter c corresponding to the CRS sequence by using the following formula_init5：

Wherein, the

The total number of OFDM symbols included in a time slot; the above-mentioned

In another possible implementation manner, the determining module is further configured to determine, according to the PCI and the timeslot number where the CRS is located, an alternative initialization parameter c corresponding to the CRS sequence by using the following formula_init6：

Wherein, the

According to another aspect of the present disclosure, an apparatus for determining a CRS sequence is provided, where the apparatus is used in an access network device, and the apparatus includes:

the acquisition module is used for acquiring the stored PCI of the target cell;

a field indication; or,

the number of the OFDM symbol where the CRS is located; or,

the number of the time slot where the CRS is located.

In another possible implementation manner, the determining module is further configured to determine an initialization parameter of the CRS sequence according to the PCI, where the initialization parameter of the CRS sequence is unrelated to time information; determining the CRS sequence based on initialization parameters of the CRS sequence.

c_init1＝(2¹⁰*X+n_ID)mod2³¹；

In another possible implementation manner, the determining module is further configured to determine an initialization parameter of the CRS sequence according to the PCI and partial information in the time information; determining the CRS sequence based on initialization parameters of the CRS sequence.

In another possible implementation manner, the determining module is further configured to determine an initialization parameter of the CRS sequence according to the PCI, the half frame indication, and/or the number of the OFDM symbol in which the CRS is located.

In another possible implementation manner, the determining module is further configured to determine, according to the PCI and the field indication, an initialization parameter c of the CRS sequence according to the following formula_init2：

Wherein, the

The total number of OFDM symbols included in a time slot; the c0 indicates the field, the c0 indicates a first value when the CRS transmission time is in the first field of a wireless frame, and the c0 indicates a second value when the CRS transmission time is in the second field of the wireless frame; the μ is used to indicate a subcarrier spacing; n is_IDThe PCI of the target cell.

In another possible implementation manner, the determining module is further configured to determine, according to the PCI and the OFDM symbol number where the CRS is located, an initialization parameter c of the CRS sequence by using the following formula_init3：

c_init3＝(2¹⁰(l+1)(2n_ID+1)+n_ID)mod2³¹；

In another possible implementation manner, the determining module is further configured to determine, according to the PCI, the field indication, and the OFDM symbol number where the CRS is located, an initialization parameter c of the CRS sequence by using the following formula_init4：

Wherein, the

The total number of OFDM symbols included in a time slot; the c0 indicates the field, the c0 indicates a first value when the CRS transmission time is in the first field of a wireless frame, and the c0 indicates a second value when the CRS transmission time is in the second field of the wireless frame; the μ is used to indicate a subcarrier spacing; the l isThe OFDM symbol number where the CRS is located; n is_IDThe PCI of the target cell.

In another possible implementation manner, the determining module is further configured to determine an initialization parameter of the CRS sequence according to the PCI and a timeslot number where the CRS is located.

In another possible implementation manner, the determining module is further configured to determine, according to the PCI and a slot number of the CRS, an initialization parameter c of the CRS sequence by using the following formula_init5：

Wherein, the

The total number of OFDM symbols included in a time slot; the above-mentioned

Numbering the time slot in which the CRS is located; n is said_IDThe PCI of the target cell.

In another possible implementation manner, the determining module is further configured to determine, according to the PCI and a slot number where the CRS is located, an initialization parameter c of the CRS sequence by using the following formula_init6：

Wherein, the

The total number of OFDM symbols included in a time slot; y is the CRS instituteThe value obtained by taking the modulus of the time slot number; n is_IDThe PCI of the target cell, the

According to another aspect of the present disclosure, there is provided a terminal device including: a processor; a memory for storing processor-executable instructions;

wherein the processor is configured to:

acquiring a Physical Cell Identity (PCI) of a target cell;

According to another aspect of the present disclosure, there is provided an access network apparatus including: a processor; a memory for storing processor-executable instructions;

wherein the processor is configured to:

acquiring the stored PCI of the target cell;

According to another aspect of the present disclosure, there is provided a non-transitory computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the above-described method.

According to the CRS sequence determining method and device, the terminal device obtains the PCI of the target cell, the CRS sequence is determined according to the PCI and is irrelevant to time information or relevant to partial information in the time information, the CRS sequence is simplified, the situation that the CRS sequence is relevant to time information such as time slot numbers and OFDM symbol numbers in the related technology is avoided, the complexity of blind detection of the CRS sequence by the terminal device under the condition that the time information is unknown is reduced, computing resources are saved, and the CRS sequence determining efficiency is improved.

Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the disclosure and, together with the description, serve to explain the principles of the disclosure.

FIG. 1 shows a schematic of the structure of an SSB;

FIG. 2 shows a schematic structural diagram of an SSB in an NTN system;

FIG. 3 shows a time domain location diagram of an SSB;

fig. 4 is a schematic structural diagram of a mobile communication system provided in an exemplary embodiment of the present disclosure;

fig. 5 is a flowchart illustrating a method for determining a CRS sequence according to an exemplary embodiment of the present disclosure;

fig. 6 shows a flowchart of a method for determining a CRS sequence according to another exemplary embodiment of the present disclosure;

fig. 7 shows a flowchart of a method for determining a CRS sequence according to another exemplary embodiment of the present disclosure;

fig. 8 is a schematic structural diagram illustrating an apparatus for determining a CRS sequence according to an embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of an apparatus for determining a CRS sequence according to another embodiment of the present disclosure;

fig. 10 shows a schematic structural diagram of a terminal device provided in an exemplary embodiment of the present disclosure;

fig. 11 shows a schematic structural diagram of an access network device according to an exemplary embodiment of the present disclosure.

Detailed Description

Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present disclosure.

In the related art, the terminal device synchronizes through a synchronization sequence broadcast by the access network device. In NR systems, the concept of SSB has emerged, which includes Primary Synchronization Signal (PSS), Secondary Synchronization Signal (SSS), PBCH, and DMRS. Namely, the PSS, SSS, PBCH and DMRS are received in four consecutive OFDM symbols and then constitute the SSB, mainly for downlink synchronization. As shown in fig. 1, the SSB is composed of a PSS located in the first symbol, an SSS located in the third symbol, a PBCH located in the second, fourth whole symbols, and a PBCH located in Resource Blocks (RBs) on both sides of the third symbol, and the PBCH-DMRS is inserted in the PBCH in a comb structure, so that the terminal device can perform channel estimation, thereby better decoding the PBCH. Wherein the SSB occupies 20 RBs in the frequency domain.

The frequency domain position occupied by the PBCH-DMRS is determined by PCI, and the PBCH-DMRS signal is a gold sequence. The initial values of the registers in the gold sequence are related to the SSB number and the PCI, and details of the sequence generation manner can be referred to the description of TS 28.2117.4.1.4 in the communication protocol, which is not described herein again.

In order to ensure the detection performance, the access network equipment transmits 2 or 4 or 8 SSBs within a half frame of 5ms by periodically transmitting the SSBs. A plurality of SSBs (e.g., 8 SSBs) form an SSB burst set, and the transmission period of the SSB burst set is configured to be 20 ms.

The process of the terminal device initially accessing the cell comprises the following steps: the terminal equipment detects the PSS/SSS sequence, obtains the basic time-frequency synchronization (slot-level timing) and determines the PCI; and blind detecting the PBCH-DMRS sequence corresponding to the PCI according to the PCI to carry out channel estimation, and simultaneously acquiring time information related to the SSB number of 3 bits.

Currently, SSBs in NTN system are shown in fig. 2, and the SSBs only contains PSS, SSS and PBCH, but no demodulation reference signal specific to PBCH is designed, and CRS on

symbols

0 and 7 is multiplexed to demodulate PBCH. As can be seen from the time domain position diagram of the SSB shown in fig. 3, although the position of the CRS relative to the SSB is also determined, the CRS sequence is unknown, and the initial value c of the CRS sequence is_initThe generation method of (a) is as follows:

wherein,

the total number of OFDM symbols included in a time slot;

is the slot number within a 10ms radio frame, and has a value range of [0, 79 ] for the case of 120kHz subcarrier spacing]A total of 80; l is an OFDM symbol number, and since CRSs can only be transmitted on

symbols

0 and 7 in an NTN system, the values of the CRSs are 2; n is_IDIs PCI.

In the related art, before PBCH is not solved, terminal equipment only knows PCI, cannot acquire a slot number and an OFDM symbol number, and can determine a CRS sequence only through multiple blind detections; but the complete time information is carried in PBCH, and the time information carried in PBCH includes: system Frame Number (SFN) +1bit half Frame indicator c0+3bit SSB Number (L)_max2/4/8). Wherein, c0 and SSB numbers are repeated with the time information carried by the CRS sequence in the related art. If the terminal equipment can determine the CRS sequence through blind detection, the CRS sequence is equivalent to the determination of the 10ms frame boundary, and then the terminal equipment does not need to point to the MIBC0 and SSB numbers are shown, but the blind detection complexity of the terminal equipment is larger.

According to the embodiment of the disclosure, the CRS sequence is simplified, so that the CRS sequence is not related to time information such as a time slot number and an OFDM symbol number any more, or the CRS sequence is related to only part of the time information, thereby reducing the complexity of blind detection of the CRS sequence by the terminal equipment under the condition that the time information is unknown.

Referring to fig. 4, a schematic structural diagram of a mobile communication system according to an exemplary embodiment of the present disclosure is shown. The mobile communication system may be a Long Term Evolution (LTE) system, or may be a 5G system, where the 5G system is also called a New Radio (NR) system, or may be a next generation mobile communication technology system of 5G, and this embodiment is not limited thereto.

Optionally, the mobile communication system is suitable for different network architectures, including but not limited to a relay network architecture, a dual link architecture, a Vehicle to internet (V2X) architecture, and the like.

The mobile communication system includes: access network device 420 and terminal device 440.

The Access Network device 420 may be a Base Station (BS), which may also be referred to as a base station device, and is a device deployed in a Radio Access Network (RAN) to provide a wireless communication function. For example, the device providing the base station function in the 2G network includes a Base Transceiver Station (BTS), the device providing the base station function in the 3G network includes a node B (english: NodeB), the device providing the base station function in the 4G network includes an evolved node B (evolved NodeB, eNB), the device providing the base station function in the Wireless Local Area Network (WLAN) is an Access Point (AP), the device providing the base station function in the 5G system is a gNB, and an evolved node B (ng-eNB), the access network device 420 in the embodiment of the present disclosure further includes a device providing the base station function in a future new communication system, and the specific implementation manner of the access network device 420 in the embodiment of the present disclosure is not limited. The access network equipment may also include Home base stations (Home enbs, henbs), relays (Relay), Pico base stations Pico, etc.

The base station controller is a device for managing a base station, such as a Base Station Controller (BSC) in a 2G network, a Radio Network Controller (RNC) in a 3G network, and a device for controlling and managing a base station in a future new communication system.

The network side network (english: network) in the embodiment of the present disclosure is a communication network that provides a communication service for the terminal device 440, and includes a base station of a radio access network, a base station controller of the radio access network, and a device on the core network side.

The Core Network may be an Evolved Packet Core (EPC), a 5G Core Network (english: 5G Core Network), or a new Core Network in a future communication system. The 5G Core Network is composed of a set of devices, and implements Access and Mobility Management functions (AMF) for Mobility Management and other functions, User Plane Function (UPF) for providing packet routing and forwarding and Quality of Service (QoS) Management and other functions, Session Management Function (SMF) for providing Session Management, IP address allocation and Management and other functions, and the like. The EPC may be composed of an MME providing functions such as mobility management, Gateway selection, etc., a Serving Gateway (S-GW) providing functions such as packet forwarding, etc., and a PDN Gateway (P-GW) providing functions such as terminal address allocation, rate control, etc.

Access network device 420 and terminal device 440 establish a wireless connection over the air. Optionally, the wireless air interface is a wireless air interface based on a 5G standard, for example, the wireless air interface is NR; or, the wireless air interface may also be a wireless air interface based on a 5G next generation mobile communication network technology standard; alternatively, the wireless air interface may be a wireless air interface based on the 4G standard (LTE system). Access network device 420 may receive the uplink data sent by terminal device 440 via the wireless connection.

Terminal device 440 may refer to a device in data communication with access network device 420. Terminal device 440 may communicate with one or more core networks via a radio access network. The terminal device 440 may be various forms of User Equipment (UE), access terminal device, subscriber unit, subscriber station, Mobile Station (MS), remote station, remote terminal device, mobile device, user terminal device, terminal device (terminal device), wireless communication device, user agent, or user equipment. The terminal device 440 may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with Wireless communication function, a computing device or other processing device connected to a Wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G Network or a terminal device in a future evolved Public Land Mobile Network (PLMN), and the like, which is not limited in this embodiment. Terminal device 440 may receive downlink data sent by access network device 420 via a wireless connection with access network device 420.

It should be noted that, when the mobile communication system shown in fig. 4 adopts the 5G system or the next-generation mobile communication technology system of 5G, the above-mentioned network elements may have different names in the 5G system or the next-generation mobile communication technology system of 5G, but have the same or similar functions, and the embodiment of the present disclosure does not limit this.

It should be noted that, in the mobile communication system shown in fig. 4, a plurality of access network devices 420 and/or a plurality of terminal devices 440 may be included, and one access network device 420 and one terminal device 440 are illustrated in fig. 4, but the embodiment of the present disclosure does not limit this.

Referring to fig. 5, a flowchart of a method for determining a CRS sequence according to an exemplary embodiment of the present disclosure is shown, which is illustrated in the mobile communication system shown in fig. 4. The method comprises the following steps.

Step 501, obtaining the PCI of the target cell.

The computer device obtains a PCI of a target cell, the PCI being used to uniquely identify the target cell among the plurality of cells.

It should be noted that the computer device in the embodiment of the present disclosure is an access network device or a terminal device.

Optionally, when the computer device is an access network device, the access network device obtains the stored PCI of the target cell. And when the computer equipment is terminal equipment, the terminal equipment acquires the PCI of the target cell in the cell searching process.

Step 502, determining a CRS sequence according to the PCI, wherein the CRS sequence is unrelated to the time information or only related to a part of the time information.

Optionally, the time information includes a field indication, a slot number of the CRS, an OFDM symbol number of the CRS, and other time information.

Optionally, the OFDM symbol numbering includes: an OFDM symbol number under an OFDM carrier or a DFT-S-OFDM symbol number under a single carrier waveform.

The CRS sequence is not related to the time information, which means that the CRS sequence is not related to any information of the time information. The CRS sequence is related to only a part of the time information, which means that for the complete time information, the CRS sequence is related to only a part of the complete time information and is not related to another part of the complete time information.

In one possible implementation, the computer device directly determines the CRS sequence according to the PCI, and the CRS sequence is uniquely determined only by the PCI, i.e., the CRS sequence is independent of the time information.

Taking a computer device as an example of a terminal device, the terminal device directly determines an initialization parameter of the CRS sequence according to the PCI, the initialization parameter of the CRS sequence is only related to the PCI, and the initialization parameter of the CRS sequence is not related to the time information at this time. In a possible implementation manner, the terminal device directly determines an initialization parameter of the CRS sequence according to the PCI, including: the terminal equipment determines the initialization parameter c of the CRS sequence according to the PCI through the following formula_init1：

c_init1＝(2¹⁰*X+n_ID)mod2³¹；

Wherein X is a fixed value or is represented by n_IDA determined value; n is_IDIs the PCI of the target cell.

For example, X is 0, or X ═ mod (n)_ID3), or X ═ n_ID/3. This example pairs X with n_IDThe manner of determination is not limited.

In this implementation, the terminal device directly determines the initialization parameter of the CRS sequence according to the PCI, thereby determining the CRS sequence without blind detection, i.e., the number of blind detections is 0.

In another possible implementation manner, the computer device determines the CRS sequence according to the PCI and the partial information in the time information, where the CRS sequence is uniquely determined by the PCI and the partial information in the time information, that is, the CRS sequence is only related to the partial information in the time information.

Taking a computer device as an example of a terminal device, the terminal device determines a CRS sequence according to the PCI by blindly detecting partial information in the time information, where the CRS sequence is only related to the PCI and partial information in the time information, but not to all time information.

Optionally, part of the information in the time information includes: a field indication; or, the number of the OFDM symbol where the CRS is located; or, the half frame indication and the OFDM symbol number where the CRS is located; or, the slot number of the CRS.

It should be noted that, the terminal device determines the CRS sequence according to the PCI through part of the information in the blind detection time information, which is referred to the following embodiments and will not be described herein.

In summary, in the embodiments of the present disclosure, by obtaining the PCI of the target cell, the CRS sequence is determined according to the PCI, and the CRS sequence is unrelated to the time information or related to only part of the information in the time information, and by simplifying the CRS sequence, the situation that the CRS sequence is related to both the time information such as the timeslot number and the OFDM symbol number in the related art is avoided, the complexity of blind detection of the CRS sequence under the condition that the time information is unknown is reduced, the calculation resource is saved, and the efficiency of determining the CRS sequence is improved.

Please refer to fig. 6, which shows a flowchart of a method for determining a CRS sequence according to another exemplary embodiment of the present disclosure, and this embodiment is illustrated by using the method in the terminal device shown in fig. 4. The method comprises the following steps.

Step 601, the terminal device detects the synchronization sequence. And acquiring the PCI of the target cell.

And the terminal equipment receives the primary synchronization sequence and the secondary synchronization sequence in the cell searching process. And acquiring time-frequency synchronization information through the primary synchronization sequence and the secondary synchronization sequence, and determining the PCI of the target cell.

It should be noted that, for the process of the terminal device acquiring the PCI of the target cell, reference may be made to relevant details in the foregoing embodiments, and details are not described herein again.

Step 602, the terminal device determines the CRS sequence according to the PCI and through part of the information in the blind detection time information.

Optionally, the determining, by the terminal device, the CRS sequence according to the PCI through part of information in the blind detection time information includes: the terminal equipment determines an alternative initialization parameter corresponding to the CRS sequence according to the PCI and partial information in the time information; and determining the CRS sequence based on the alternative initialization parameters corresponding to the CRS sequence.

The terminal equipment determines the alternative initialization parameters corresponding to the CRS sequence according to the partial information in the PCI and the time information, and the method comprises the following steps: and the terminal equipment determines the alternative initialization parameters corresponding to the CRS sequence through a preset formula according to the PCI, the half frame indication and/or the OFDM symbol number where the CRS is located. Or determining alternative initialization parameters corresponding to the CRS sequence through a preset formula according to the time slot numbers of the PCI and the CRS.

In a possible implementation manner, the terminal device determines the alternative initialization parameter c corresponding to the CRS sequence according to the PCI and the field indication by the following formula_init2：

Wherein,

the total number of OFDM symbols included in a time slot; c0 is a field indication, c0 is a first value when the transmission time of the CRS is in the first field of the radio frame, and c0 is a second value when the transmission time of the CRS is in the second field of the radio frame; μ is used to indicate the subcarrier spacing; n is_IDIs the PCI of the target cell.

Alternatively, when the Cyclic Prefix (CP) of the physical channel is a Normal CP (NCP),

is 14; when the CP of the physical channel is an Extended CP (ECP),

is 12.

The radio frame includes two equal-sized fields, each field consisting of 5 subframes. The first half of a radio frame (e.g., half frame 0) consists of 0 to 4 subframes, and the second half of the radio frame (e.g., half frame 1) consists of 5 to 9 subframes. And a field indication for indicating whether the transmission time of the CRS is in the first field or the second field of the wireless frame.

Wherein c0 is the first value when the CRS transmission time is in the first half of the radio frame, and c0 is the second value when the CRS transmission time is in the second half of the radio frame. For example, the first value is 0 and the second value is 1. This embodiment is not limited thereto.

Alternatively, when μ is equal to 1, it indicates that a 30kHz subcarrier spacing is used, which is a time-domain shortening of one time slot by one time compared to a 15kHz time slot. A 15kHz subcarrier spacing of 1ms corresponds to a time slot, then 1ms for mu is 2^μAnd a time slot.

In this implementation, the terminal device determines the CRS sequence through blind detection c0 according to the PCI, that is, the number of blind detections is 2. Or, the field indication c0 is a value preconfigured by a protocol, that is, the SSB may be sent only in the first field or the second field of the radio frame through a protocol constraint, that is, the field indication c0 is determined, at this time, the terminal device does not need to perform blind detection, and the number of blind detections is 0.

In another possible implementation manner, the terminal device determines the alternative initialization parameter c corresponding to the CRS sequence according to the OFDM symbol number where the PCI and the CRS are located, by using the following formula_init3：

c_init3＝(2¹⁰(l+1)(2n_ID+1)+n_ID)mod2³¹；

Wherein l is the OFDM symbol number of the CRS; n is_IDIs the PCI of the target cell.

Optionally, the OFDM symbol number l includes: an OFDM symbol number under an OFDM carrier or a DFT-S-OFDM symbol number under a single carrier waveform.

In this implementation, the terminal device determines the initial parameter of the CRS sequence by blind-detecting the OFDM symbol number l according to the PCI, so as to determine the CRS sequence, where the OFDM symbol number l may only be 0 or 7, that is, the number of blind detections is 2.

In another possible implementation manner, the terminal device determines the alternative initialization parameter c corresponding to the CRS sequence according to the PCI, the half frame indication, and the OFDM symbol number where the CRS is located, by using the following formula_init4：

Wherein,

the total number of OFDM symbols included in a time slot; c0 is a half frame indication, c0 is a first value when the CRS transmission time is in the first half frame of the wireless frame, and c0 is a second value when the CRS transmission time is in the second half frame of the wireless frame; mu is used as indicatorCarrier spacing; l is the OFDM symbol number where CRS is located; n is_IDIs the PCI of the target cell.

For example, the first value is 0 and the second value is 1. It should be noted that, for the related introduction of the field indication, reference may be made to the related description in the foregoing implementation, and details are not described here again.

In this implementation, the terminal device determines the CRS sequence through the blind detection field indicator c0 and the OFDM symbol number l according to the PCI, where the field indicator c0 takes a value of a first value or a second value, and the OFDM symbol number l takes a value of 0 or 7, that is, the number of blind detections is 4. Alternatively, the field indication c0 is a value pre-configured by a protocol, that is, SSB may be transmitted only in the first or second half of the radio frame by the protocol constraint, that is, the field indication c0 is determined, and the number of blind detections is 2.

In another possible implementation manner, the terminal device determines, according to the PCI and the slot number of the CRS, the alternative initialization parameter c corresponding to the CRS sequence by using the following formula_init5：

Wherein,

the total number of OFDM symbols included in a time slot;

numbering time slots in which CRSs are located; n is_IDIs the PCI of the target cell.

In this implementation, the terminal device determines the CRS sequence by blindly detecting the timeslot number where the CRS is located according to the PCI. When the worst case Lmax is 8, the slot positions where the SSB may transmit are {0, 1, 2, 3, 40, 41, 42, 43}, i.e., the number of blind detections is 8. Alternatively, the field indicator c0 is a value pre-configured by the protocol, i.e. SSB may only be transmitted in the first or second half of the radio frame by the protocol constraint, i.e. it is determined that the candidate timeslot number set may only be {0, 1, 2, 3} or {40, 41, 42, 43}, and the number of blind detections is 4.

Illustratively, the terminal device determines the alternative initialization parameter c corresponding to the CRS sequence according to the slot number of the PCI and the CRS sequence by the following formula_init6：

Wherein,

the total number of OFDM symbols included in a time slot; y is a value obtained by modulus of the time slot number of the CRS; n is_IDIs the PCI of the target cell and,

mu is used to indicate the subcarrier spacing for the slot number where the CRS is located.

It should be noted that, for related introduction of μ, reference may be made to the related description in the foregoing implementation, and details are not repeated here.

In the implementation mode, the terminal device determines the CRS sequence according to the PCI by blindly detecting a value obtained by modulo of a slot number where the CRS is located. In the worst case, Lmax is 8, the slot position where the SSB may transmit is {0, 1, 2, 3}, i.e., the number of blind detections is 4.

Optionally, at least two values exist in part of the time information, and the terminal device determines, according to the PCI and the part of the time information, candidate initialization parameters corresponding to the at least two values of the part of the information by using a preset formula, so as to determine candidate sequences corresponding to the at least two candidate initialization parameters. And the terminal equipment determines a CRS sequence in at least two candidate sequences, and a candidate value corresponding to an initialization parameter for generating the CRS sequence is the value of partial information in the time information.

Illustratively, the determining, by the terminal device, the CRS sequence in at least two candidate sequences includes: and the terminal equipment correlates the at least two candidate sequences with the received signal respectively to obtain correlation values corresponding to the at least two candidate sequences respectively, and determines the candidate sequence with the maximum correlation value as a CRS sequence.

Optionally, the terminal device assumes that a reference signal sequence r (m) of an SSB is defined as:

wherein c (2m) is a pseudo-random sequence, j is an imaginary number,

and configuring the maximum downlink bandwidth. c (2m) may be initialized with initialization parameters of the CRS sequence.

It should be noted that, compared to the CRS sequences in the related art, the CRS sequences provided in the embodiments of the present disclosure are simplified CRS sequences, and the simplified CRS sequences are no longer related to time information such as slot numbers and OFDM symbol numbers, or the simplified CRS sequences are related to only part of the time information. The simplified CRS sequence can be applied to all time slots in the system; or, the simplified CRS sequence is only applied to the time slots containing the SSBs, so that the terminal device defaults to the simplified CRS sequence in the initial synchronization stage, and after the terminal device accesses the target cell, it may determine which time slots contain the SSBs according to the indication of the system message, and use the simplified CRS sequence; those using slots that do not contain SSBs use the original CRS sequence, i.e. the CRS sequence including time information.

In summary, the embodiment of the present disclosure further enables the terminal device to directly determine the initialization parameter of the CRS sequence according to the PCI, so as to determine the CRS sequence, so that the CRS sequence is no longer related to time information such as a timeslot number and an OFDM symbol number, and further the terminal device can determine the CRS sequence without blind detection, thereby greatly improving the efficiency of determining the CRS sequence.

The CRS sequence is determined by the terminal equipment according to the PCI through partial information in the blind test time information, so that the CRS sequence is only related to partial time information in the CRS sequence, and the complexity of blind test of the CRS sequence by the terminal equipment under the condition that the time information is unknown is further reduced.

If the NTN system still continues the phase pre-compensation and post-compensation of NR R-15, the embodiment of the present disclosure further determines, by the terminal device, the candidate initialization parameter corresponding to the CRS sequence according to the PCI and the OFDM symbol number where the CRS is located, or determines the candidate initialization parameter corresponding to the CRS sequence according to the PCI, the half frame indication and the OFDM symbol number where the CRS is located, thereby avoiding a situation that the terminal device performs post-compensation before PBCH is resolved in a related art to affect the device performance, so that the value of the OFDM symbol number can be obtained by blind detection of the CRS sequence, and the implementation complexity is reduced.

Referring to fig. 7, a flowchart of a method for determining a CRS sequence according to another exemplary embodiment of the present disclosure is shown, which is illustrated in the embodiment when the method is used in the access network device shown in fig. 4. The method comprises the following steps.

Step 701, the access network device obtains the PCI of the target cell.

The access network device obtains the PCI of the target cell stored in the access network device, that is, the access network device obtains the PCI of the local cell stored in the access network device.

Optionally, one access network device stores the PCI of one target cell.

Step 702, the access network equipment determines an initialization parameter of the CRS sequence according to the PCI, wherein the initialization parameter of the CRS sequence is irrelevant to time information; or, determining the initialization parameter of the CRS sequence according to the PCI and partial information in the time information.

Optionally, the initialization parameter of the CRS sequence is not related to the time information or is related to only part of the time information.

The access network equipment directly determines the initialization parameter of the CRS sequence according to the PCI, and the initialization parameter of the CRS sequence is irrelevant to time information; or the access network equipment determines the initialization parameters of the CRS sequence according to the PCI and partial information in the time information, wherein the initialization parameters of the CRS sequence are only related to partial information in the time information, but not to the whole time information.

Optionally, part of the information in the time information includes: a field indication; or, the orthogonal frequency division multiplexing OFDM symbol number where the CRS is located; or, the half frame indication and the OFDM symbol number where the CRS is located; or, the slot number of the CRS.

Optionally, the determining, by the access network device, the initialization parameter of the CRS sequence according to the PCI and the partial information in the time information includes: determining an initialization parameter of a CRS sequence according to the PCI, a half frame indication and/or the number of an OFDM symbol where the CRS is located; or determining the initialization parameters of the CRS sequence according to the PCI and the number of the time slot where the CRS is located.

In a possible implementation manner, the access network device determines the initialization parameter c of the CRS sequence according to the PCI by the following formula_init1：

c_init1＝(2¹⁰*X+n_ID)mod2³¹；

In another possible implementation manner, the access network device determines the initialization parameter c of the CRS sequence according to the PCI and the field indication by the following formula_init2：

Wherein,

the total number of OFDM symbols included in a time slot; c0 is a half frame indication, c0 is a first value when the CRS transmission time is in the first half frame of the wireless frame, and c0 is a second value when the CRS transmission time is in the second half frame of the wireless frame; μ is used to indicate the subcarrier spacing; n is_IDIs the PCI of the target cell.

In another possible implementationIn the method, the access network equipment determines an initialization parameter c of a CRS sequence according to the PCI and the number of the OFDM symbol where the CRS is located by the following formula_init3：

c_init3＝(2¹⁰(l+1)(2n_ID+1)+n_ID)mod2³¹；

In another possible implementation manner, the access network device determines the initialization parameter c of the CRS sequence according to the PCI, the half frame indication, and the OFDM symbol number where the CRS is located, by using the following formula_init4：

Wherein,

the total number of OFDM symbols included in a time slot; c0 is a half frame indication, c0 is a first value when the CRS transmission time is in the first half frame of the wireless frame, and c0 is a second value when the CRS transmission time is in the second half frame of the wireless frame; μ is used to indicate the subcarrier spacing; l is the OFDM symbol number where CRS is located; n is_IDIs the PCI of the target cell.

In another possible implementation manner, the access network device determines the initialization parameter c of the CRS sequence according to the slot numbers of the PCI and the CRS, and by using the following formula_init5：

Wherein,

the total number of OFDM symbols included in a time slot;

when CRS is presentSlot numbering; n is_IDIs the PCI of the target cell.

In another possible implementation manner, the access network device determines the initialization parameter c of the CRS sequence according to the slot numbers of the PCI and the CRS, and by using the following formula_init6：

Wherein,

It should be noted that the implementation manner of determining the initialization parameter of the CRS sequence by the access network device according to the PCI may be similar to the implementation manner of determining the initialization parameter of the CRS sequence by the reference terminal device according to the PCI, and is not described herein again.

In step 703, the access network device determines the CRS sequence based on the initialization parameter of the CRS sequence.

It should be noted that the access network device determines the CRS sequence based on the initialization parameter of the CRS sequence, which may be similar to the reference terminal device determining the relevant details of the CRS sequence based on the initialization parameter of the CRS sequence, and is not described herein again.

To sum up, the embodiment of the present disclosure further obtains the PCI of the target cell through the access network device, and determines the initialization parameter of the CRS sequence according to the PCI, where the initialization parameter of the CRS sequence is unrelated to the time information; or, the initialization parameter of the CRS sequence is determined according to the PCI and the partial information in the time information, so that the CRS sequence is determined based on the initialization parameter of the CRS sequence, and by simplifying the CRS sequence, the situation that the CRS sequence is complex for subsequent blind detection of the terminal device corresponding to the related art under the condition that the time information is unknown is avoided, the calculation resource is saved, and the efficiency of determining the CRS sequence is improved.

In the following, embodiments of the apparatus according to embodiments of the present disclosure are described, and for parts of the embodiments of the apparatus not described in detail, reference may be made to technical details disclosed in the above method embodiments.

Please refer to fig. 8, which illustrates a schematic structural diagram of an apparatus for determining a CRS sequence according to an embodiment of the present disclosure. The CRS sequence determining means may be implemented by software, hardware, or a combination of both, as all or a part of the terminal device. The apparatus for determining the CRS sequence includes: an acquisition module 810 and a determination module 820.

An obtaining module 810, configured to obtain a PCI of a target cell;

a determining module 820, configured to determine a CRS sequence according to the PCI, where the CRS sequence is unrelated to the time information or only related to a part of the time information.

In one possible implementation, part of the information in the time information includes:

a field indication; or,

the number of the OFDM symbol where the CRS is located; or,

indicating a half frame and numbering an OFDM symbol where the CRS is located; or,

the number of the time slot in which the CRS is located.

In another possible implementation manner, the determining module 820 is further configured to determine an initialization parameter of the CRS sequence according to the PCI, where the initialization parameter of the CRS sequence is unrelated to the time information; and determining the CRS sequence based on the initialization parameter of the CRS sequence.

In another possible implementation manner, the determining module 820 is further configured to determine the initialization parameter c of the CRS sequence according to the PCI by the following formula_init1：

c_init1＝(2¹⁰*X+n_ID)mod2³¹；

Wherein X is fixedA value of either n_IDA determined value; n is_IDIs the PCI of the target cell.

In another possible implementation manner, the determining module 820 is further configured to determine the CRS sequence according to the PCI by blind detection of part of information in the time information.

In another possible implementation manner, the determining module 820 is further configured to determine, according to the PCI and partial information in the time information, an alternative initialization parameter corresponding to the CRS sequence; and determining the CRS sequence based on the alternative initialization parameters corresponding to the CRS sequence.

In another possible implementation manner, the determining module 820 is further configured to determine, according to the PCI, the half frame indication and/or the number of the OFDM symbol where the CRS is located, the alternative initialization parameter corresponding to the CRS sequence by using a preset formula.

In another possible implementation manner, the determining module 820 is further configured to determine, according to the PCI and the field indication, the alternative initialization parameter c corresponding to the CRS sequence according to the following formula_init2：

Wherein,

In another possible implementation manner, the determining module 820 is further configured to determine, according to the PCI and the OFDM symbol number where the CRS is located, the alternative initialization parameter c corresponding to the CRS sequence according to the following formula_init3：

c_init3＝(2¹⁰(l+1)(2n_ID+1)+n_ID)mod2³¹；

Wherein l is the OFDM symbol where CRS is locatedNumbering; n is_IDIs the PCI of the target cell.

In another possible implementation manner, the determining module 820 is further configured to determine, according to the PCI, the field indication, and the OFDM symbol number where the CRS is located, the alternative initialization parameter c corresponding to the CRS sequence according to the following formula_init4：

Wherein,

In another possible implementation manner, the determining module 820 is further configured to determine, according to the timeslot numbers of the PCI and the CRS, the alternative initialization parameter corresponding to the CRS sequence by using a preset formula.

In another possible implementation manner, the determining module 820 is further configured to determine, according to the PCI and the timeslot number where the CRS is located, the alternative initialization parameter c corresponding to the CRS sequence according to the following formula_init5：

Wherein,

the total number of OFDM symbols included in a time slot;

In another possible implementation manner, the determining module 820 is further configured to determine, according to the slot numbers of the PCI and the CRS, the alternative initialization parameter c corresponding to the CRS sequence by using the following formula_init6：

Wherein,

the total number of OFDM symbols included in a time slot; y is a value obtained by taking a module of the time slot number where the CRS is located; n is_IDIs the PCI of the target cell and,

It should be noted that, when the apparatus provided in the foregoing embodiment implements the functions thereof, only the division of the above functional modules is illustrated, and in practical applications, the above functions may be distributed by different functional modules according to actual needs, that is, the content structure of the device is divided into different functional modules, so as to complete all or part of the functions described above.

With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.

Please refer to fig. 9, which shows a schematic structural diagram of an apparatus for determining a CRS sequence according to another embodiment of the present disclosure. The CRS sequence determining means may be implemented by software, hardware, or a combination of both, as all or part of the access network equipment. The apparatus for determining the CRS sequence includes: an acquisition module 910 and a determination module 920.

An obtaining module 910, configured to obtain a stored PCI of a target cell;

a determining module 920, configured to determine a CRS sequence according to the PCI, where the CRS sequence is unrelated to the time information or only related to a part of the time information.

a field indication; or,

the orthogonal frequency division multiplexing OFDM symbol number where the CRS is located; or,

the half frame indication and the number of the OFDM symbol where the CRS is located; or,

the number of the time slot in which the CRS is located.

In another possible implementation manner, the determining module 920 is further configured to determine an initialization parameter of the CRS sequence according to the PCI, where the initialization parameter of the CRS sequence is unrelated to the time information; and determining the CRS sequence based on the initialization parameter of the CRS sequence.

In another possible implementation manner, the determining module 920 is further configured to determine the initialization parameter c of the CRS sequence according to the PCI by the following formula_init1：

c_init1＝(2¹⁰*X+n_ID)mod2³¹；

In another possible implementation manner, the determining module 920 is further configured to determine an initialization parameter of the CRS sequence according to the PCI and partial information in the time information; and determining the CRS sequence based on the initialization parameter of the CRS sequence.

In another possible implementation manner, the determining module 920 is further configured to determine an initialization parameter of the CRS sequence according to the PCI, the half frame indication, and/or an OFDM symbol number where the CRS is located.

In another possible implementation manner, the determining module 920 is further configured to determine the initialization parameter c of the CRS sequence according to the PCI and the field indication by the following formula_init2：

Wherein,

In another possible implementation manner, the determining module 920 is further configured to determine the initialization parameter c of the CRS sequence according to the PCI and the OFDM symbol number where the CRS is located by the following formula_init3：

c_init3＝(2¹⁰(l+1)(2n_ID+1)+n_ID)mod2³¹；

In another possible implementation manner, the determining module 920 is further configured to determine the initialization parameter c of the CRS sequence according to the PCI, the half frame indication, and the OFDM symbol number where the CRS is located, by using the following formula_init4：

Wherein,

the total number of OFDM symbols included in a time slot; c0 is a half frame indication, c0 is a first value when the CRS transmission time is in the first half frame of the wireless frame, and c0 is a second value when the CRS transmission time is in the second half frame of the wireless frame; μ is used to indicate the subcarrier spacing; l is the OFDM symbol number of the CRS; n is_IDIs the PCI of the target cell.

In another possible implementation manner, the determining module 920 is further configured to determine an initialization parameter of a CRS sequence according to the PCI and a timeslot number where the CRS is located.

In another possible implementation manner, the determining module 920 is further configured to determine the initialization parameter c of the CRS sequence according to the PCI and the timeslot number where the CRS is located, by using the following formula_init5：

Wherein,

the total number of OFDM symbols included in a time slot;

In another possible implementation manner, the determining module 920 is further configured to determine the initialization parameter c of the CRS sequence according to the PCI and the timeslot number where the CRS is located, by using the following formula_init6：

Wherein,

Referring to fig. 10, a schematic structural diagram of a terminal device according to an exemplary embodiment of the present disclosure is shown, where the terminal device may be the terminal device 440 in the mobile communication system shown in fig. 4. In this embodiment, a terminal device is taken as an example of a UE in an LTE system or a 5G system for explanation, where the terminal device includes: a processor 101, a receiver 102, a transmitter 103, a memory 104, and a bus 105. The memory 104 is connected to the processor 101 through a bus 105.

The processor 101 includes one or more processing cores, and the processor 101 executes various functional applications and information processing by running software programs and modules.

The receiver 102 and the transmitter 103 may be implemented as a communication component, which may be a communication chip, and the communication chip may include a receiving module, a transmitting module, a modulation and demodulation module, and the like, for modulating and/or demodulating information and receiving or transmitting the information through a wireless signal.

Memory 104 may be used to store processor 101 executable instructions.

Memory 104 may store at least one application module 106 that functions as described. The application module 106 may include: an acquisition module 1061 and a determination module 1062.

The processor 101 is configured to execute the obtaining module 1061 to implement the functions of the obtaining step performed by the terminal device in the foregoing method embodiments; the processor 101 is further configured to execute the determining module 1062 to implement the functions of the determining step performed by the terminal device in the above-described embodiments of the method.

Further, the memory 104 may be implemented by any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.

Referring to fig. 11, a schematic structural diagram of an access network device according to an exemplary embodiment of the present disclosure is shown, where the access network device may be the access network device 420 in the implementation environment shown in fig. 4. In this embodiment, an access network device is taken as an eNB in an LTE system or a gNB in a 5G system as an example for explanation, and the access network device includes: a processor 111, a receiver 112, a transmitter 113, a memory 114, and a bus 115. The memory 114 is connected to the processor 111 via a bus 115.

The processor 111 includes one or more processing cores, and the processor 111 executes various functional applications and information processing by executing software programs and modules.

The receiver 112 and the transmitter 113 may be implemented as a communication component, which may be a communication chip, and the communication chip may include a receiving module, a transmitting module, a modulation and demodulation module, and the like, for performing modulation and demodulation on information and receiving or transmitting the information through a wireless signal.

The memory 114 may be used to store processor 101 executable instructions.

Memory 114 may store at least one application module 116 that functions as described. The application modules 116 may include: an obtaining module 1161 and a determining module 1162.

The processor 111 is configured to execute the obtaining module 1161 to implement the functions of the obtaining step performed by the access network device in the foregoing method embodiments; the processor 111 is further configured to execute the determining module 1162 to implement the functions of the determining step performed by the access network device in the various method embodiments described above.

Further, the memory 114 may be implemented by any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.

The embodiment of the disclosure further provides a system for determining the CRS sequence, and the system includes a terminal device and an access network device.

In a possible implementation manner, the terminal device includes the determining device for the CRS sequence provided in fig. 8, and the access network device includes the determining device for the CRS sequence provided in fig. 9.

In another possible implementation manner, the terminal device includes the terminal device provided in fig. 10 above, and the access network device includes the access network device provided in fig. 11 above.

The present disclosure may be systems, methods, and/or computer program products. The computer program product may include a computer-readable storage medium having computer-readable program instructions embodied thereon for causing a processor to implement various aspects of the present disclosure.

The computer readable storage medium may be a tangible device that can hold and store the instructions for use by the instruction execution device. The computer readable storage medium may be, for example, but not limited to, an electronic memory device, a magnetic memory device, an optical memory device, an electromagnetic memory device, a semiconductor memory device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a Static Random Access Memory (SRAM), a portable compact disc read-only memory (CD-ROM), a Digital Versatile Disc (DVD), a memory stick, a floppy disk, a mechanical coding device, such as punch cards or in-groove projection structures having instructions stored thereon, and any suitable combination of the foregoing. Computer-readable storage media as used herein is not to be interpreted as a transitory signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., optical pulses through a fiber optic cable), or an electrical signal transmitted through an electrical wire.

The computer-readable program instructions described herein may be downloaded from a computer-readable storage medium to a respective computing/processing device, or to an external computer or external storage device over a network, such as the internet, a local area network, a wide area network, and/or a wireless network. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers and/or edge servers. The network adapter card or network interface in each computing/processing device receives computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in a computer-readable storage medium in the respective computing/processing device.

The computer program instructions for carrying out operations of the present disclosure may be assembler instructions, Instruction Set Architecture (ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider). In some embodiments, the electronic circuitry that can execute the computer-readable program instructions implements aspects of the present disclosure by utilizing the state information of the computer-readable program instructions to personalize the electronic circuitry, such as a programmable logic circuit, a Field Programmable Gate Array (FPGA), or a Programmable Logic Array (PLA).

Various aspects of the present disclosure are described herein with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the disclosure. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-readable program instructions.

These computer-readable program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. These computer-readable program instructions may also be stored in a computer-readable storage medium that can direct a computer, programmable data processing apparatus, and/or other devices to function in a particular manner, such that the computer-readable medium storing the instructions comprises an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks.

The computer readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer, other programmable apparatus or other devices implement the functions/acts specified in the flowchart and/or block diagram block or blocks.

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of instructions, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or technical improvements to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A method for determining a CRS sequence of a cell-specific reference signal (CRS), the method being used in a terminal device and comprising:

acquiring a Physical Cell Identity (PCI) of a target cell;

determining the CRS sequence according to the PCI;

wherein the CRS sequence is independent of time information; or,

the CRS sequence is only related to part of the time information, the CRS sequence is not related to both a time slot number and an Orthogonal Frequency Division Multiplexing (OFDM) symbol number, and the part of the time information comprises: a field indication; or, the number of the OFDM symbol where the CRS is located; or, the half frame indication and the OFDM symbol number where the CRS is located; or, the number of the time slot in which the CRS is located.

2. The method of claim 1, wherein the determining the CRS sequence according to the PCI comprises:

3. The method of claim 2, wherein the determining initialization parameters for the CRS sequence according to the PCI comprises:

c_init1＝(2¹⁰*X+n_ID)mod2³¹；

4. The method of claim 1, wherein the determining the CRS sequence from the PCI comprises:

5. The method according to claim 4, wherein the determining the CRS sequence according to the PCI by blindly detecting partial information in the time information comprises:

6. The method according to claim 5, wherein the determining, according to the PCI and the partial information in the time information, the initialization parameter of the candidate corresponding to the CRS sequence comprises:

and determining alternative initialization parameters corresponding to the CRS sequence through a preset formula according to the PCI, the half frame indication and/or the OFDM symbol number where the CRS is located.

7. The method according to claim 6, wherein the determining, according to the PCI, the half-frame indication, and/or the number of the OFDM symbol in which the CRS is located, the alternative initialization parameter corresponding to the CRS sequence by using a preset formula includes:

according to the PCI and the half frame indication, determining an alternative initialization parameter c corresponding to the CRS sequence through the following formula_init2：

Wherein, the

8. The method according to claim 6, wherein the determining, according to the PCI, the half-frame indication, and/or the number of the OFDM symbol in which the CRS is located, the alternative initialization parameter corresponding to the CRS sequence by using a preset formula includes:

c_init3＝(2¹⁰(l+1)(2n_ID+1)+n_ID)mod2³¹；

9. The method according to claim 6, wherein the determining, according to the PCI, the half-frame indication, and/or the number of the OFDM symbol in which the CRS is located, the alternative initialization parameter corresponding to the CRS sequence by using a preset formula includes:

Wherein, the

10. The method according to claim 5, wherein the determining, according to the PCI and the partial information in the time information, the initialization parameter of the candidate corresponding to the CRS sequence comprises:

11. The method according to claim 10, wherein the determining, according to the slot number where the PCI and the CRS are located, the alternative initialization parameter corresponding to the CRS sequence by using a preset formula includes:

Wherein, the

The total number of OFDM symbols included in a time slot; the above-mentioned

12. The method according to claim 10, wherein the determining, according to the slot number where the PCI and the CRS are located, the alternative initialization parameter corresponding to the CRS sequence by using a preset formula includes:

Wherein, the

The total number of OFDM symbols included in a time slot; the Y is a value obtained by taking a module of the time slot number where the CRS is located; n is_IDThe PCI for the target cell, the

13. A method for determining a CRS sequence, which is used in an access network device, and comprises:

acquiring the stored PCI of the target cell;

determining the CRS sequence according to the PCI;

wherein the CRS sequence is independent of time information; or,

the CRS sequence is only related to partial information in the time information, and the CRS sequence is not related to both slot number and OFDM symbol number; part of the information in the time information comprises: a field indication; or, the number of the OFDM symbol where the CRS is located; or, the half frame indication and the OFDM symbol number where the CRS is located; or, the number of the time slot in which the CRS is located.

14. The method of claim 13, wherein the determining the CRS sequence according to the PCI comprises:

15. The method of claim 14, wherein the determining initialization parameters for the CRS sequence according to the PCI comprises:

c_init1＝(2¹⁰*X+n_ID)mod2³¹；

16. The method of claim 13, wherein the determining the CRS sequence according to the PCI comprises:

17. The method of claim 16, wherein the determining initialization parameters of the CRS sequence according to the PCI and the partial information of the time information comprises:

18. The method according to claim 17, wherein the determining initialization parameters of the CRS sequence according to the PCI, a half frame indication and/or an OFDM symbol number where the CRS is located comprises:

Wherein, the

The total number of OFDM symbols included in a time slot; the c0 is the half frame indication when the CRS is transmittedC0 is a first value when the CRS is transmitted in the first half of a radio frame, and c0 is a second value when the CRS is transmitted in the second half of the radio frame; the μ is used to indicate a subcarrier spacing; n is_IDThe PCI of the target cell.

19. The method according to claim 17, wherein the determining initialization parameters of the CRS sequence according to the PCI, a half frame indication and/or an OFDM symbol number where the CRS is located comprises:

c_init3＝(2¹⁰(l+1)(2n_ID+1)+n_ID)mod2³¹；

20. The method according to claim 17, wherein the determining initialization parameters for the CRS sequence according to the PCI, a half frame indication, and/or an OFDM symbol number where the CRS is located comprises:

Wherein, the

The total number of OFDM symbols included in a time slot; the c0 indicates the field, the c0 indicates a first value when the CRS transmission time is in the first field of a radio frame, and the c indicates a second value when the CRS transmission time is in the second field of the radio frame0 is a second value; the μ is used to indicate a subcarrier spacing; the l is the OFDM symbol number where the CRS is located; n is_IDThe PCI of the target cell.

21. The method of claim 16, wherein the determining initialization parameters of the CRS sequence according to the PCI and the partial information of the time information comprises:

22. The method of claim 21, wherein the determining initialization parameters of the CRS sequence according to the PCI and a slot number of the CRS comprises:

Wherein, the

The total number of OFDM symbols included in a time slot; the above-mentioned

23. The method of claim 21, wherein the determining initialization parameters of the CRS sequence according to the PCI and a slot number of the CRS comprises:

according to the PCI and the time slot number of the CRS, determining the beginning of the CRS sequence by the following formulaInitialization parameter c_init6：

Wherein, the

24. An apparatus for determining a CRS sequence, the apparatus being used in a terminal device, and comprising:

the acquisition module is used for acquiring the PCI of the target cell;

a determining module, configured to determine the CRS sequence according to the PCI;

wherein the CRS sequence is independent of time information; or,

the CRS sequence is only related to part of the time information, the CRS sequence is not related to both slot number and OFDM symbol number, and the part of the time information comprises: a field indication; or, the number of the OFDM symbol where the CRS is located; or, the half frame indication and the OFDM symbol number where the CRS is located; or, the number of the time slot in which the CRS is located.

25. An apparatus for determining a CRS sequence, configured for use in an access network device, the apparatus comprising:

the acquisition module is used for acquiring the stored PCI of the target cell;

wherein the CRS sequence is independent of time information; or,

26. A terminal device, characterized in that the terminal device comprises: a processor; a memory for storing processor-executable instructions;

wherein the processor is configured to:

acquiring a Physical Cell Identity (PCI) of a target cell;

determining a CRS sequence according to the PCI;

wherein the CRS sequence is independent of time information; or,

27. An access network device, characterized in that the access network device comprises: a processor; a memory for storing processor-executable instructions;

wherein the processor is configured to:

acquiring the stored PCI of the target cell;

determining a CRS sequence according to the PCI;

wherein the CRS sequence is independent of time information; or,

the CRS sequence is only related to part of the time information, the CRS sequence is not related to both slot number and OFDM symbol number, and the part of the time information comprises: a field indication; or, the number of the OFDM symbol where the CRS is located; or, the half frame indication and the number of the OFDM symbol where the CRS is located; or, the number of the time slot in which the CRS is located.

28. A non-transitory computer readable storage medium having stored thereon computer program instructions, wherein the computer program instructions, when executed by a processor, implement the method of any one of claims 1 to 23.