CN107371244B

CN107371244B - Method and device for notifying and sending PRACH (physical random Access channel) information

Info

Publication number: CN107371244B
Application number: CN201610319661.XA
Authority: CN
Inventors: 苟伟; 赵亚军; 杨玲; 李新彩
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2016-05-13
Filing date: 2016-05-13
Publication date: 2023-06-02
Anticipated expiration: 2036-05-13
Also published as: CN107371244A

Abstract

The invention provides a method and a device for notifying and sending PRACH information, wherein the method for notifying the PRACH information comprises the following steps: the base station configures PRACH information, wherein the PRACH information comprises at least one of the following types of information: first type information for representing information common to the UE in the plurality of timing groups TAGs; a second type of information for representing credits common to a plurality of carriers within each TAG of the UE; third type information for representing information specific to each carrier within each TAG of the UE; the base station informs the user equipment UE of PRACH information. The PRACH is supported to be transmitted in an unauthorized carrier wave to introduce new signaling, so that the resource configuration for supporting the PRACH can be optimized for parameters of the PRACH among a plurality of TAGs or in the TAGs, and the effect of reducing signaling overhead is achieved.

Description

Method and device for notifying and sending PRACH (physical random Access channel) information

Technical Field

The present invention relates to the field of communications, and in particular, to a method and apparatus for notifying and sending PRACH information.

Background

In the related art, long Term Evolution (LTE) communication networks are all deployed and operated in licensed carriers, and with the development of LTE, some companies propose "research on the problem of LTE deployment in unlicensed carriers", such as the high-pass company in the united states thinks: with the rapid growth of data traffic, the licensed carrier will not be able to withstand the huge amount of data brought about by the rapid traffic growth in the near future. Consider that by deploying LTE in an unlicensed carrier, so as to share data traffic in the licensed carrier, the data volume pressure caused by traffic growth can be addressed. Meanwhile, the unlicensed carrier has the following characteristics: on one hand, because the unlicensed carrier does not need to be purchased or the carrier resource is zero-cost, the unlicensed carrier is free or low-cost; on the other hand, as the personnel and enterprises can participate in deployment, equipment of equipment providers can also participate in deployment, so that the admission requirement of unauthorized carriers is low; furthermore, the unlicensed carrier has sharing property, and when a plurality of different systems are operated therein or when different operators of the same system are operated therein, some sharing resource modes can be considered, so as to improve carrier efficiency.

In summary, although LTE deployment has significant advantages in unlicensed carriers, there are still problems in the deployment process; among them, many wireless access technologies (different communication standards are crossed, cooperation is difficult, network topology is various) and many wireless access sites (the number of users is large, cooperation difficulty is large, and centralized management overhead is large). Due to the large number of radio access technologies, various wireless systems exist in the unlicensed carrier, so that the wireless systems are difficult to coordinate with each other, and the interference is serious. Therefore, for LTE deployment in unlicensed carriers, there is still a need to support policing of unlicensed carriers, and most countries require support for listen-before-talk mechanisms when systems are deployed in unlicensed carriers. Interference caused by simultaneous use of unlicensed carriers between adjacent systems can be avoided by a listen-before-talk mechanism. And further, a contention back-off mechanism is introduced, namely, adjacent system stations (generally adjacent transmission nodes of the same system), so that interference caused when the adjacent transmission nodes of the same system use unlicensed carriers at the same time can be avoided after the contention back-off mechanism. Moreover, regulations state that devices using unlicensed carriers, including base stations and User Equipments (UEs), need to perform listen-before-talk (i.e., clear channel assessment (Clear Channel Assessment, CCA), also known as LBT) before transmitting, and that devices can use unlicensed carrier channels for data transmission when the channels are idle.

The unlicensed carrier introduces an LBT mechanism, so that the transmission opportunity of a physical random access channel (Physical Random Access Channel, abbreviated as PRACH) sequence is reduced, for example, the PRACH cannot be transmitted in time due to CCA failure of the UE, and whether the existing PRACH is enhanced or not is considered among a plurality of unlicensed carriers in a timing group (Time Alignment Group, abbreviated as TAG) so as to improve the access opportunity of the PRACH in the unlicensed carrier.

When the PRACH is executed among a plurality of carriers in the TAG, the corresponding signaling is designed to support the enhancement of the PRACH among the plurality of carriers, and the signaling cost is small and the implementation is easy. No effective solution has been found yet.

Disclosure of Invention

The embodiment of the invention provides a method and a device for notifying and sending PRACH information, which are used for introducing new signaling for supporting PRACH transmission in an unauthorized carrier wave so as to enable resource configuration for supporting PRACH to be subjected to parameter optimization aiming at PRACH among a plurality of TAGs or in the TAGs.

According to an embodiment of the present invention, there is provided a method for notifying PRACH information, including: the base station configures physical random access channel PRACH information, wherein the PRACH information comprises at least one of the following types of information: first type information for representing information common to the UE in the plurality of timing groups TAGs; a second type of information for representing credits common to a plurality of carriers within each TAG of the UE; third type information for representing information specific to each carrier within each TAG of the UE; the base station informs the User Equipment (UE) of the PRACH information.

Optionally, the first type of information includes at least one of: type information supported by PRACH, and indication information of the PRACH by the UE at a plurality of TAGs; and/or, the second type of information comprises PRACH sequence information; and/or, the third type of information includes at least one of: PRACH subframe configuration information, physical resource block (Physical Resource Block, abbreviated PRB) resource configuration information in the frequency domain.

Optionally, the PRACH information further includes at least one of: initial orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, abbreviated OFDM) of PRACH

Symbol, end OFDM symbol of PRACH, and PRACH transmission mode, where the PRACH transmission mode includes one of the following: the same PRACH sequence is repeatedly transmitted for each symbol in the LTE scheme.

Optionally, when the PRACH information further includes a starting orthogonal frequency division multiplexing OFDM symbol of the PRACH, after the base station notifies the PRACH information to the UE, the method further includes: and before the starting OFDM symbol transmits the PRACH, the UE detects and determines that the channel is in an idle state.

Optionally, the base station configures the PRACH start OFDM symbol in the complete subframe to include: symbol 0, 1, or symbol 0, 1, 2; or, the base station configures the PRACH start OFDM symbol in an incomplete subframe to include one of: symbols 11, 9, 7, 5.

Optionally, the starting OFDM symbol of the PRACH includes one of: and transmitting the PRACH from a starting time point of the starting OFDM symbol, and transmitting the PRACH from a middle sample point of the starting OFDM symbol.

Optionally, the ending OFDM symbol of the PRACH includes a symbol where an ending position of a guard interval GT in the PRACH is located, where the ending position of the GT includes one of the following: and the ending time point of the ending OFDM symbol and the appointed sample point in the ending OFDM symbol.

Optionally, the PRACH transmission mode includes one of the following: when the PRACH is transmitted, a plurality of OFDM symbols of the PRACH repeatedly transmit the same PRACH sequence; in PRACH transmission, a plurality of OFDM symbols of PRACH continuously transmit one PRACH sequence.

Optionally, the PRACH information is configured as information specifying DCI, where the specified DCI is sent as downlink grant information or sent as uplink grant information.

Optionally, the base station informs the UE of the PRACH information by at least one of: is transmitted by scrambling a common radio network temporary identity, RNTI, using a common downlink control information (Downlink Control Information, abbreviated DCI) scheme; scrambling and transmitting through a UE-dedicated radio network temporary identifier (Radio Network Temporary Identifier, abbreviated as RNTI) by using a UE-dedicated DCI mode; the group DCI scheme is used to transmit through the RNTI scrambling of the UE group.

Optionally, the notifying, by the base station, the PRACH information to the UE includes: the base station informs the PRACH information to the UE using a physical hybrid automatic repeat request indicator channel (Physical Hybrid ARQ Indicator Channel, abbreviated PHICH) defined in the LTE system.

According to an embodiment of the present invention, there is provided a method for transmitting PRACH information, including: receiving PRACH information configured by a base station; transmitting the PRACH information on an unlicensed carrier; wherein the PRACH information includes at least one of: first type information for representing information common to the UE in a plurality of timing groups TAGs; a second type of information for representing credits common to a plurality of carriers within each TAG of the UE; and third type information, which is used for representing information specific to each carrier in each TAG of the UE.

Optionally, the first type of information includes at least one of: type information supported by PRACH, and indication information of the PRACH by the UE at a plurality of TAGs; and/or, the second type of information comprises PRACH sequence information; and/or, the third type of information includes at least one of: PRACH subframe configuration information, PRB resource configuration information of a frequency domain.

Optionally, the PRACH information further includes at least one of: a starting OFDM symbol of the PRACH, an ending OFDM symbol of the PRACH, and a PRACH transmission mode, wherein the PRACH transmission mode comprises one of the following steps: the same PRACH sequence is repeatedly transmitted for each symbol in the LTE scheme.

According to an embodiment of the present invention, there is provided a method for configuring a PRACH subframe, including: the base station uses the appointed parameter to configure PRACH subframe information; the base station sends the PRACH subframe information to UE; wherein, the specified parameter is used for representing subframe information sent by PRACH.

Optionally, the specified parameters include: describing the period or interval of subframes for PRACH transmission; the interval of the first occurrence of the PRACH subframe with respect to the subframe transmitting the PRACH subframe information or the interval of the first occurrence of the PRACH subframe with respect to the subframe transmitting the PRACH trigger signaling is described, or the starting subframe position of the PRACH transmission is described.

Optionally, the specified parameters further include: the maximum number of allowed transmissions per PRACH is described.

Optionally, the specified parameters include: describing the period or interval of subframes for PRACH transmission; describing the interval of the PRACH subframe which occurs for the first time relative to the subframe for transmitting PRACH subframe information or the interval of the PRACH subframe which occurs for the first time relative to the subframe for transmitting PRACH trigger signaling, or describing the position of the initial subframe for PRACH transmission; describes unlicensed carrier LAA information supporting PRACH transmission; describing the maximum number of allowed transmissions per PRACH;

Optionally, the specified parameters further include: when the LAA carriers are plural, a carrier order when the PRACH is transmitted between the LAA carriers is described.

Optionally, the specified parameters include: describing the interval of the PRACH subframe which occurs for the first time relative to the subframe for transmitting PRACH subframe information or the interval of the PRACH subframe which occurs for the first time relative to the subframe for transmitting PRACH trigger signaling, or describing the position of the initial subframe for PRACH transmission; candidate subframe number at each PRACH transmission; and configuring the interval of the subframes or configuring the carrier information of the initial subframe position.

Optionally, the PRACH subframe information is sent to the UE by at least one of: sent by DCI, sent by radio resource control RRC message.

According to another embodiment of the present invention, there is provided a PRACH information notification apparatus including: a configuration module, configured to configure physical random access channel PRACH information, where the PRACH information includes at least one of the following types of information: first type information for representing information common to the UE in a plurality of timing groups TAGs; a second type of information for representing credits common to a plurality of carriers within each TAG of the UE; third type information for representing information specific to each carrier within each TAG of the UE; and the notification module is used for notifying the PRACH information to the User Equipment (UE).

According to another embodiment of the present invention, there is provided a PRACH information transmitting apparatus including: the receiving module is used for receiving PRACH information configured by the base station; a sending module, configured to send the PRACH information on an unlicensed carrier; wherein the PRACH information includes at least one of: first type information for representing information common to the UE in a plurality of timing groups TAGs; a second type of information for representing credits common to a plurality of carriers within each TAG of the UE; and third type information, which is used for representing information specific to each carrier in each TAG of the UE.

According to another embodiment of the present invention, there is provided a configuration apparatus of a PRACH subframe, including: a configuration module, configured to configure PRACH subframe information using specified parameters; a sending module, configured to send the PRACH subframe information to a UE; wherein, the specified parameter is used for representing subframe information sent by PRACH.

According to still another embodiment of the present invention, there is also provided a storage medium. The storage medium is arranged to store program code for performing the steps of:

configuring physical random access channel PRACH information, wherein the PRACH information comprises at least one of the following types of information:

A first type of information for representing information common to the UE in a plurality of timing group resources TAG; a second type of information for representing credits common to a plurality of carriers within each TAG of the UE; third type information for representing information specific to each carrier within each TAG of the UE;

and notifying the PRACH information to User Equipment (UE).

According to the invention, as the base station configures the PRACH information, the PRACH information comprises at least one of the following types of information: first type information for representing information common to the UE in a plurality of timing groups TAGs; a second type of information for representing credits common to a plurality of carriers within each TAG of the UE; third type information for representing information specific to each carrier within each TAG of the UE; the base station informs the user equipment UE of the PRACH information, and the invention provides a method for introducing new signaling for supporting the PRACH to be transmitted in an unauthorized carrier wave so as to support the resource configuration of the PRACH to perform parameter optimization aiming at the PRACH among a plurality of TAGs or in the TAGs, thereby achieving the effect of reducing signaling overhead.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:

Fig. 1 is a block diagram of a hardware structure of a mobile terminal according to a PRACH information notification method according to an embodiment of the present invention;

fig. 2 is a flowchart of a method of notification of PRACH information according to an embodiment of the invention;

fig. 3 is a flowchart of a method of transmitting PRACH information according to an embodiment of the present invention;

fig. 4 is a flowchart of a method of configuring PRACH subframes according to an embodiment of the present invention;

fig. 5 is a block diagram illustrating a structure of a PRACH information notification apparatus according to an embodiment of the present invention;

fig. 6 is a block diagram of a structure of a PRACH information transmitting apparatus according to an embodiment of the present invention;

fig. 7 is a block diagram of a configuration apparatus of a PRACH subframe according to an embodiment of the present invention.

Detailed Description

The invention will be described in detail hereinafter with reference to the drawings in conjunction with embodiments. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above-described drawings are used for distinguishing between similar objects and not necessarily for indicating a particular order or sequence.

Example 1

The method according to the first embodiment of the present application may be performed in a similar computing device of the base station. Taking a base station as an example, fig. 1 is a block diagram of a hardware structure of a mobile terminal according to an embodiment of the present invention. As shown in fig. 1, the base station 10 may include one or more (only one is shown in the figure) processors 102 (the processors 102 may include, but are not limited to, a microprocessor MCU or a processing device such as a programmable logic device FPGA), a memory 104 for storing data, and a transmission device 106 for communication functions. It will be appreciated by those of ordinary skill in the art that the configuration shown in fig. 1 is merely illustrative and is not intended to limit the configuration of the electronic device described above. For example, the base station 10 may also include more or fewer components than shown in fig. 1, or have a different configuration than shown in fig. 1.

The memory 104 may be configured to store software programs and modules of application software, such as program instructions/modules corresponding to the PRACH information notification method in the embodiment of the present invention, and the processor 102 executes the software programs and modules stored in the memory 104 to perform various functional applications and data processing, that is, implement the method described above. Memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include memory remotely located relative to the processor 102, which may be connected to the base station 10 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

The transmission means 106 is arranged to receive or transmit data via a network. The specific examples of the network described above may include a wireless network provided by a communication provider of the base station 10. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, NIC) that can connect to other network devices through a base station to communicate with the internet. In one example, the transmission device 106 may be a Radio Frequency (RF) module for communicating with the internet wirelessly.

In this embodiment, a method for notifying PRACH information running in the base station is provided, and fig. 2 is a flowchart of a method for notifying PRACH information according to an embodiment of the present invention, as shown in fig. 1, where the flowchart includes the following steps:

step S202, the base station configures PRACH information of a physical random access channel, where the PRACH information includes at least one of the following types of information:

first type information for representing information common to the UE in the plurality of timing groups TAGs; a second type of information for representing credits common to a plurality of carriers within each TAG of the UE; third type information for representing information specific to each carrier within each TAG of the UE;

in step S204, the base station notifies the PRACH information to the user equipment UE.

Through the steps, as the base station configures the PRACH information, the PRACH information comprises at least one of the following types of information: a first type of information for representing information common to the UE in the plurality of timing group resources TAG; a second type of information for representing credits common to a plurality of carriers within each TAG of the UE; third type information for representing information specific to each carrier within each TAG of the UE; the invention provides a method for introducing new signaling for supporting PRACH transmission in an unauthorized carrier wave, so that the resource configuration for supporting PRACH can optimize parameters for PRACH among a plurality of TAGs or in the TAGs, and the effect of reducing signaling overhead is achieved.

Alternatively, the execution subject of the above steps may be a base station or the like, but is not limited thereto.

Optionally, the first type of information includes at least one of: type information supported by PRACH, indication information of the PRACH carried out by UE at a plurality of TAGs;

the second type of information includes PRACH sequence information;

the third type of information includes at least one of: PRACH subframe configuration information, PRB resource configuration information of a frequency domain.

Optionally, in addition to the above-mentioned types of information, the PRACH information may further include one or more of the following: a starting OFDM symbol of the PRACH, an ending OFDM symbol of the PRACH, and a PRACH transmission mode, wherein the PRACH transmission mode comprises one of the following steps: the same PRACH sequence is repeatedly transmitted for each symbol in the LTE scheme.

In an alternative implementation manner according to the present embodiment, when the PRACH information further includes a starting orthogonal frequency division multiplexing OFDM symbol of the PRACH, after the base station notifies the UE of the PRACH information, the method further includes: before the initial OFDM symbol transmits the PRACH, the UE detects and determines that the channel is in a idle state, wherein the detection can be CCA detection, and when the channel is determined to be idle, the equipment can use an unauthorized carrier channel to transmit data.

Optionally, when the base station is configured to notify the UE of PRACH information in a complete subframe, the starting OFDM symbol includes one of: symbol 0, 1, or alternatively, symbol 0, 1, 2, as another case, when the base station notifies the user equipment UE of PRACH information in the incomplete subframe, the starting OFDM symbol includes: symbols 11, 9, 7, 5.

Optionally, the starting OFDM symbol of the PRACH includes one of: the PRACH is transmitted from a starting point of time of the starting OFDM symbol, and the PRACH is transmitted from an intermediate point of time of the starting OFDM symbol.

Optionally, the ending OFDM symbol of the PRACH includes a symbol in which an ending position of the guard interval GT in the PRACH is located, where the ending position of GT includes one of the following: ending time point of ending OFDM symbol and appointed sample point in ending OFDM symbol.

Specifically, the PRACH transmission mode includes one of the following: when the PRACH is transmitted, a plurality of OFDM symbols of the PRACH repeatedly transmit the same PRACH sequence; in PRACH transmission, a plurality of OFDM symbols of PRACH continuously transmit one PRACH sequence.

Alternatively, the PRACH information may be configured as information specifying DCI, where the specified DCI is transmitted as downlink grant information or transmitted as uplink grant information.

When the PRACH information is sent to the receiving UE, the base station may notify the UE of the PRACH information by:

scrambling and transmitting through a public Radio Network Temporary Identifier (RNTI) by using a public Downlink Control Information (DCI) mode;

the DCI mode special for the UE is used for scrambling and sending through the RNTI special for the UE;

the group DCI scheme is used to transmit through the RNTI scrambling of the UE group.

In addition, the base station notifying the UE of PRACH information includes: the base station informs the UE of PRACH information using a physical hybrid automatic repeat request indicator channel PHICH defined in the LTE system.

The present embodiment also proposes a method of a receiving end of PRACH information, and fig. 3 is a flowchart of a method for sending PRACH information according to an embodiment of the present invention, as shown in fig. 3, where the flowchart includes the following steps:

step S302, PRACH information configured by a base station is received;

step S304, PRACH information is sent on an unlicensed carrier;

wherein the PRACH information includes at least one of: first type information for representing information common to the UE in the plurality of timing groups TAGs; a second type of information for representing credits common to a plurality of carriers within each TAG of the UE; and third type information for representing information specific to each carrier within each TAG of the UE.

the second type of information includes PRACH sequence information;

Alternatively, the PRACH information may include at least one of the following in addition to: a starting OFDM symbol of the PRACH, an ending OFDM symbol of the PRACH, and a PRACH transmission mode, wherein the PRACH transmission mode comprises one of the following steps: the same PRACH sequence is repeatedly transmitted for each symbol in the LTE scheme. In this embodiment, the starting OFDM symbol of the PRACH may be a starting symbol of a CP of the PRACH, and the ending OFDM symbol of the PRACH may be an ending symbol of a guard interval GT of the PRACH, or an ending symbol of a PRACH sequence, and the PRACH transmission manner may include: the existing LTE transmission scheme is adopted, or the same PRACH sequence is repeatedly transmitted for each symbol.

In this embodiment, a method for configuring a PRACH subframe is also provided, and fig. 4 is a flowchart of a method for configuring a PRACH subframe according to an embodiment of the present invention, as shown in fig. 4, where the flowchart includes the following steps:

Step S402, the base station uses the appointed parameter to configure PRACH subframe information;

step S404, the base station transmits PRACH subframe information to the UE;

wherein, the appointed parameter is used for representing the subframe information sent by PRACH.

Specifically, the specified parameters include a plurality of combinations, mode one: the specified parameters include:

describing the period or interval of subframes for PRACH transmission;

the interval of the first occurrence of the PRACH subframe with respect to the subframe transmitting the PRACH subframe information or the interval of the first occurrence of the PRACH subframe with respect to the subframe transmitting the PRACH trigger signaling is described, or the starting subframe position of the PRACH transmission is described.

In addition to the above two, the first aspect may further include: the maximum number of allowed transmissions per PRACH is described.

In a second mode, the specified parameters include:

describing the period or interval of subframes for PRACH transmission;

describing the interval of the PRACH subframe which occurs for the first time relative to the subframe for transmitting PRACH subframe information or the interval of the PRACH subframe which occurs for the first time relative to the subframe for transmitting PRACH trigger signaling, or describing the position of the initial subframe for PRACH transmission;

describes unlicensed carrier LAA information supporting PRACH transmission, i.e., describes which unlicensed carriers LAA support PRACH transmission;

the maximum number of allowed transmissions per PRACH is described.

In addition to the above two, the second mode may further include: when the LAA carriers are plural, a carrier order when the PRACH is transmitted between the LAA carriers is described.

Mode three, the specified parameters include:

candidate subframe number at each PRACH transmission;

the interval of the subframe is configured or the carrier information of the starting subframe position is configured.

Alternatively, PRACH subframe information may be sent to the UE by: sent by DCI, sent by radio resource control RRC message.

Through the embodiment, the PRACH subframe configuration scheme can support the same PRACH process in multiple carriers in the TAG, so as to support PRACH in multiple carriers in the TAG.

From the description of the above embodiments, it will be clear to a person skilled in the art that the method according to the above embodiments may be implemented by means of software plus the necessary general hardware platform, but of course also by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising several instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method of the various embodiments of the present invention.

Example 2

The embodiment also provides a device for sending PRACH information, a notification device, and a device for configuring PRACH subframes, where the device is used to implement the foregoing embodiments and preferred embodiments, and the description is omitted. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.

Fig. 5 is a block diagram illustrating a structure of a PRACH information notification apparatus according to an embodiment of the present invention, as shown in fig. 5, including:

a configuration module 50, configured to configure PRACH information of a physical random access channel, where the PRACH information includes at least one of the following types of information:

a notification module 52, configured to notify the user equipment UE of PRACH information.

Fig. 6 is a block diagram illustrating a structure of a PRACH information transmitting apparatus according to an embodiment of the present invention, as shown in fig. 6, including:

a receiving module 60, configured to receive PRACH information configured by a base station;

a transmitting module 62, configured to transmit PRACH information on an unlicensed carrier;

Fig. 7 is a block diagram of a configuration apparatus of a PRACH subframe according to an embodiment of the present invention, as shown in fig. 7, including:

a configuration module 70, configured to configure PRACH subframe information using the specified parameters;

a transmitting module 72, configured to transmit PRACH subframe information to the UE;

It should be noted that each of the above modules may be implemented by software or hardware, and for the latter, it may be implemented by, but not limited to: the modules are all located in the same processor; alternatively, the above modules may be located in different processors in any combination.

Example 3

The present embodiment includes two parts of content, DCI design and subframe configuration specific signaling design:

the DCI optimization design is not only suitable for the PRACH of multiple carriers. Comprising the following steps:

mode 1, setting 3 kinds of information in DCI as PRACH supporting multiple carriers, specifically includes: class 1 information for representing information common in a plurality of TAGs of the UE; class 2 information for indicating information of credits common to a plurality of carriers within each TAG of the UE; class 3 information for representing information specific to each carrier within each TAG of the UE.

Wherein the class 1 information includes, but is not limited to, one or more of the following: type information (e.g., contended, non-contended) supported by the PRACH indicates that the UE is PRACH at multiple TAGs. The class 2 information includes, but is not limited to, one or more of the following: PRACH sequence information. Class 3 information includes, but is not limited to, one or more of the following: PRACH subframe configuration information, PRB resource configuration information of a frequency domain.

Mode 2, setting type 2 information in DCI as PRACH supporting multiple carriers, specifically includes: class 2 information for indicating information of credits common to a plurality of carriers within each TAG of the UE; class 3 information for representing information specific to each carrier within each TAG of the UE.

Wherein the class 2 information includes, but is not limited to, one or more of the following: PRACH sequence information. Class 3 information includes, but is not limited to, one or more of the following: PRACH subframe configuration information, PRB resource configuration information of a frequency domain.

In the foregoing modes 1 and 2, the signaling for PRACH configuration may further include one or more of the following: a starting OFDM symbol of PRACH, an ending OFDM symbol of PRACH, and a PRACH transmission scheme (e.g., a scheme using existing LTE, or alternatively, the same PRACH sequence is repeatedly transmitted for each symbol).

The specific signaling design is configured for the subframe, which comprises the following steps:

mode 1 is configured by the following parameters:

parameter 1, describes the subframe period or interval of the current PRACH transmission.

Parameter 2, describing a subframe interval of the PRACH subframe which is configured relative to the PRACH subframe which is configured for transmitting the current time (or a subframe interval of the PRACH subframe which is configured relative to the PRACH which is configured for transmitting the current time), or describing a starting subframe of the PRACH transmission (in a mode of radio frame+subframe number).

Parameter 3, the maximum number of allowed transmissions per PRACH (calculated per carrier separately, default to be the same per carrier, if the number of times all carriers are calculated, the number of carriers needs to be multiplied), is optional. Each carrier within the default TAG is of the same configuration.

Mode 2, configured by the following parameters:

parameter 4 is the same as parameter 1 of embodiment 1.

Parameter 5, describing a subframe interval of the PRACH subframe which is configured relative to the PRACH subframe which is configured for transmitting the current time (or a subframe interval of the PRACH subframe which is configured relative to the PRACH which is configured for transmitting the current time), or describing a starting subframe of the PRACH transmission (in a mode of radio frame+subframe number). Only the first carrier may be described, the other carriers being inferred at default intervals.

Parameter 6, corresponding carriers (describing PRACH supported in those (LAA) carriers).

Parameter 7, carrier order (optional parameters, which may be agreed).

Parameter 8, parameter 3 of mode 1.

Mode 3 is configured by the following parameters.

Parameter 9, describing a subframe interval of the PRACH subframe which is configured relative to the PRACH subframe which is configured for transmitting the current time (or a subframe interval of the PRACH subframe which is configured relative to the PRACH trigger signaling which is transmitted for the current time) or describing a starting subframe of the PRACH transmission (in a mode of radio frame+subframe number).

Parameter 10, describes the number of consecutive subframes.

Parameter 11, the corresponding carrier (describing for which carrier parameter 9, parameter 10 is configured).

Each carrier is defaulted to remain the same.

Specific embodiments are described in detail below in connection with particular scenarios,

example 1

For ease of illustration, assume the following scenario: assuming that UE1 has 2 TAGs, TAG1 is the primary TAG, including Pcell of the licensed carrier, and the unlicensed carrier; TAG2 is a secondary TAG, comprising several unlicensed carriers and scells of licensed carriers.

And when the base station finds that the uplink timing of the UE1 is problematic, triggering the UE1 to execute the PRACH. At this time, the base station configures corresponding trigger information in the following manner.

The trigger information includes:

class 1 information: non-competing PRACH means that this UE1 needs to perform non-competing PRACH in TAG1 and TAG 2.

Class 2 information: PRACH sequence index 1 of TAG1, PRACH sequence index 2 of TAG 2. The PRACH is performed using a sequence corresponding to the sequence index 1 in all carriers in TAG1, and the PRACH is performed using a sequence corresponding to the sequence index 2 in all carriers in TAG 2.

Class 3 information: PRACH subframe configuration information of carrier 1 of TAG1, PRB resource configuration information of frequency domain, PRACH subframe configuration information of carrier 2 of TAG1, PRB resource configuration information of frequency domain.

PRACH subframe configuration information of carrier 1 of TAG2, PRB resource configuration information of frequency domain. PRACH subframe configuration information of carrier 2 of TAG2, PRB resource configuration information of frequency domain.

The base station transmits the configured information to the UE1, and then the UE1 analyzes the configuration information of the PRACH according to the agreed information format. And then sending the corresponding PRACH according to the configuration information.

A new DCI format is designed to carry the above information. The base station agrees with the UE with a new DCI format, which contains the above 3 types of information for triggering the UE to transmit PRACH as required.

Example 2

For ease of illustration, assume the following scenario:

assuming that UE1 has 2 TAGs, TAG1 is the primary TAG, including Pcell of the licensed carrier, and the unlicensed carrier; TAG2 is a secondary TAG, comprising several unlicensed carriers and scells of licensed carriers.

The trigger information includes:

A new DCI format is designed to carry the above information. The base station agrees with the UE with a new DCI format, which contains the above-mentioned 2 types of information for triggering the UE to transmit PRACH as required.

Example 3

The base station configures a starting OFDM symbol position of the PRACH for the UE.

In the PRACH subframe configured by the base station, when the base station knows that the previous subframe of the PRACH subframe is a complete subframe (that is, the data configured by the previous subframe is sent to the last OFDM symbol), the base station can configure the UE to send the PRACH starting OFDM symbol (which may be the CP starting symbol of the PRACH) to be symbol 1 (the starting time point of symbol 1 is the sending time point) or symbol 0 (where the actual sending time point is the agreed sample point in symbol 0) of the subframe. The UE needs to perform CCA before the transmission time point in the designated symbol, satisfying CCA detection requirements (e.g., channel idle for a fixed duration). If CCA detection meets the requirements, the UE can start transmitting PRACH (including cp+sequence+gt (Guard Time, guard interval)) at a sample point in the indicated symbol.

The embodiment refers to a symbol in the PRACH of the UE that the GT ends if the base station configures the end OFDM symbol position of the PRACH for the UE. It may also be the end point of time at which the OFDM symbol ends, or some predetermined point in the symbol.

If the position of the fixed sample point is the appointed sample point in the symbol, the position of the fixed sample point needs to be appointed in advance or standardized.

If the base station configures the transmission mode of the PRACH for the UE, the UE needs to execute the corresponding PRACH transmission according to the designated transmission mode. The specific modes comprise: the same PRACH sequence is repeatedly transmitted by each of a plurality of OFDM (or DFTS-OFDM) symbols of 1, PRACH, and one PRACH sequence is continuously transmitted by a plurality of OFDM symbols of 2, PRACH (this mode is the mode adopted by LTE at present, for example, PRACH format 0).

A new DCI format is designed, or the above information is carried in the DCI format in the above embodiments 1 and 2, or in the existing DCI format.

Example 4

Assuming that UE1 has 2 TAGs, TAG1 is the primary TAG, including Pcell of the licensed carrier, and the unlicensed carrier; TAG2 is a secondary TAG, comprising several unlicensed carriers and scells of licensed carriers. Suppose UE1 needs PRACH in TAG 2.

In embodiments 1 and 2, PRACH subframe configuration information is referred to, and specific subframe configuration information is:

A specific signaling is designed, and the signaling may be dynamically transmitted in the physical layer through DCI (for example, a common DCI mode, or a group DCI mode, or a professional DCI mode of UE), or may be considered to carry the subframe configuration information through RRC message.

It should be noted that if the base station configures the PRACH subframe through the above signaling in the unlicensed carrier, since the configured base station cannot keep always occupying the unlicensed carrier like in the licensed carrier, when the CCA of the UE before transmitting the PRACH in the PRACH subframe configured by the base station fails, the UE cannot transmit the PRACH using the PRACH subframe, and thus the PRACH subframe is actually occupied by other devices, and in this case, if the PRACH is triggered by the UE, the UE needs to forward to the PRACH subframe configured next to continue to attempt to transmit the PRACH. The corresponding base station also needs to attempt to receive the PRACH of the UE in the next configured PRACH subframe.

The base station configures a subframe of the PRACH in the following manner. Suppose UE1 performs PRACH in TAG 1.

Mode 1:

parameter 1, describes the subframe period or interval of the current PRACH transmission. The value is 2 subframes (2 milliseconds).

And the parameter 2 describes the subframe interval of the PRACH subframe which is firstly generated relative to the subframe configured for transmitting the PRACH subframe (or the subframe interval of the PRACH subframe which is firstly generated relative to the subframe configured for transmitting the PRACH trigger signaling). The value is 6 subframes. This approach is suitable for dynamically indicating subframe locations. If the starting subframe (by way of radio frame+subframe number) describing the current PRACH transmission is adopted, for example, the value is radio frame number 0, and subframe 0. This approach is suitable for indicating the subframe position in a semi-static manner.

And a parameter 3, which is a maximum number of times allowed to be transmitted per PRACH (each carrier is calculated independently, and is the same by default, if the number of times of all carriers is calculated, the number of carriers needs to be multiplied), and is optional, and takes a value of 3.

The PRACH subframe configuration for each carrier within the TAG1 group of UE1 is assumed to be the same. As can be known from the above assumption, the subframe configured to send the PRACH subframe is assumed to be subframe n, and the PRACH subframe is: subframes n+6, n+6+2, n+6+2+2 are in each carrier within the TAG1 group.

If the parameter 2 adopts a radio frame+subframe mode, the subframes of the PRACH are subframe 0, subframe 2, subframe 4, subframe 6 and subframe 8 of each radio frame. In this way, after the UE receives the current PRACH trigger signaling, the interval between the first PRACH subframe and the subframe where the current PRACH trigger signaling is located still needs to be predetermined.

Example 5

Assuming that the UE1 has 2 TAGs, TAG1 is a primary TAG, including a primary serving cell Pcell of an licensed carrier, and an unlicensed carrier; TAG2 is a secondary TAG, and comprises a plurality of unlicensed carriers and a secondary serving cell Scell of the licensed carrier. Suppose UE1 needs PRACH in TAG 2.

Mode 2:

and 4, describing the subframe period or interval of the PRACH transmission. The value is 2 subframes (2 milliseconds).

And 5, describing the subframe interval of the PRACH subframe which is firstly generated relative to the subframe configured for transmitting the PRACH subframe (or the subframe interval of the PRACH subframe which is firstly generated relative to the subframe configured for transmitting the PRACH trigger signaling). The value is 6 subframes. This approach is suitable for dynamically indicating subframe locations.

Parameter 6, the corresponding carrier, describes the PRACH supported in those LAA carriers. Carrier 1, carrier 2 in TAG1 group (assuming carrier 1, carrier 2 and carrier 3 are included in TAG1 group, where carrier 3 does not support PRACH this time).

Parameter 7, carrier order (optional parameters, which may be agreed). The first PRACH subframe generated in the above manner is configured in carrier 1 in TAG1, and the first PRACH subframe configured in carrier 2 in TAG1 is the 2 nd PRACH subframe generated in the above manner. The second PRACH subframe in carrier 1 in TAG1 is the 3 rd PRACH subframe generated in the above manner, and the second PRACH subframe in carrier 2 in TAG1 is the 4 th PRACH subframe generated in the above manner. The 3 rd PRACH subframe in carrier 1 in TAG1 is the 5 th PRACH subframe generated in the above manner, and the 3 rd PRACH subframe in carrier 2 in TAG1 is the 6 th PRACH subframe generated in the above manner.

And a parameter 8, which is a maximum number of times allowed to be transmitted by the PRACH each time (each carrier is calculated independently, and each carrier is the same by default), and if the maximum number of times allowed to be transmitted by the PRACH is calculated as the sum of the number of times of all carriers, the number of the carriers is multiplied), wherein the parameter is optional, and takes a value of 3.

The PRACH subframe configuration for each carrier within the TAG1 group of UE1 is assumed to be the same. As can be known from the above assumption, the subframe configured to send the PRACH subframe is assumed to be subframe n, and the PRACH subframe is: sub-frames n+6, n+6+2+2, n+6+2+2+2 in carrier 1, sub-frames n+6+2, n+6+2+2, n+6+2+2+2+2+2 in carrier 2.

Example 6

Mode 3:

and the parameter 9 describes that the PRACH subframe which appears for the first time is opposite to the subframe interval configured by the PRACH subframe which sends the current time (or the PRACH subframe which appears for the first time is opposite to the subframe interval which sends the PRACH trigger signaling) and takes 6 subframes.

Parameter 10, describes the number of consecutive subframes. Take 3 values.

Parameter 11, the corresponding carrier (describing for which carrier parameter 9, parameter 10 is configured), describes the PRACH support in those LAA carriers. Carrier 1, carrier 2 in TAG1 group (assuming carrier 1, carrier 2 and carrier 3 are included in TAG1 group, where carrier 3 does not support PRACH this time).

Each carrier is defaulted to remain the same.

The PRACH subframe configuration for each carrier within the TAG1 group of UE1 is assumed to be the same. As can be known from the above assumption, the subframe configured to send the PRACH subframe is assumed to be subframe n, and the PRACH subframe is: subframes n+6, n+6+1, n+6+2 in carrier 1, subframes n+6, n+6+1, n+6+2 in carrier 2.

Example 7

The present embodiment relates to a problem that the UE increases PRACH transmission power.

In the prior art, when the UE does not receive feedback corresponding to the base station after sending the PRACH, the UE considers that the PRACH is failed to send this time, and when the UE sends the PRACH next time, the UE increases the sending power of the PRACH according to the convention. At this time, the base station also detects and receives according to the PRACH after power boosting in a stipulated manner.

However, in the LAA system, because the CCA needs to be performed before the PRACH is transmitted, only when the CCA detection channel is idle, the UE can transmit the PRACH, but when the CCA detection fails, whether the UE continues to boost power the next time needs to be clear, otherwise, the understanding of the base station and the UE will be problematic, so that inaccurate factors occur in the PRACH reception detection of the base station.

Two processing modes are provided below:

in the mode 1, when the CCA execution detection result before the PRACH is transmitted by the UE is busy, the UE cannot transmit the PRACH, and the UE continues to execute the CCA at the subsequent PRACH transmission position, and when the detection channel is idle, the UE transmits the PRACH, and at this time, the UE can increase the power relative to the last PRACH transmission when transmitting the PRACH. At this time, the UE and the base station treat the PRACH failure due to the CCA failure last time as the UE transmitted the PRACH, but did not receive the response of the base station. This approach does not require defining a new power boost approach, and the existing power boost approach is followed, only one additional factor is added to trigger the PRACH failure, e.g., the CCA failure causes the PRACH to be unable to transmit, and is also classified as a PRACH failure.

Therefore, in the LAA carrier, when the UE fails to perform CCA to cause the PRACH to be unable to be transmitted, the UE should boost the transmission power of the PRACH at the next PRACH transmission. The base station also receives the PRACH according to the power boosted by the UE.

In mode 2, when the UE fails to transmit the PRACH due to CCA failure, the UE does not boost power when transmitting the PRACH next time compared to the PRACH transmitted last time. And the UE needs to inform the base station (existing UCI may be used) that it is due to CCA failure. At this time, the UE indicates, through the physical layer, that the corresponding higher layer protocol (MAC layer) unit does not perform power boosting. After receiving the CCA detection failure reported by the UE and not sending the PRACH, the base station considers that the UE does not raise power relatively to the last time when receiving the PRACH next time.

It is further required to supplement that, when each transmission subframe (including the candidate subframes) of the PRACH is embodied in the form of a window, a PRACH transmission window is configured for each signaling triggering the PRACH transmission, for example, each time the window length of the PRACH is 4 subframes, 4 subframes in the window can be used for the PRACH transmission (or a part of subframes in the window are used for the PRACH transmission), and when the CCA of the UE fails before the first PRACH subframe is transmitted, the UE continues CCA detection as the PRACH transmission before the second PRACH subframe is transmitted. When PRACH is sent by PRACH subframes in the whole primary window, power boosting is not performed. When the PRACH is transmitted in the PRACH window of the next time, the UE increases the power relative to the PRACH transmission in the PRACH window of the last time. I.e. power boosting when PRACH transmission is performed according to the PRACH transmission window.

At this time, regardless of whether a single subframe or window is used for each PRACH, the interval between two PRACH opportunities (or between two PRACH windows if windowed) needs to be longer than the base station receives the CCA failure information sent by the UE. For example, the subframe n and the subframe n+k are 2 PRACH transmission opportunities, and the UE cannot transmit the PRACH in the subframe n due to the CCA failure, so that the UE transmits the information of the CCA failure to the base station in the subframe n (the subframe n of the grant carrier), and the UE does not need to boost power when the PRACH transmission is performed again in the subframe n+k, where k subframes need to satisfy the duration of the base station receiving and processing the information of the CCA failure. For PRACH candidate subframe configuration with a window, PRACH subframes in adjacent windows also satisfy the duration of time for the base station to receive and process CCA failure information.

The interval between PRACH transmission windows may be k subframes, i.e., the end position of a first window is spaced k subframes from the start position of the next window.

Or, the calculation of the PRACH window is calculated from the first PRACH subframe specified after the PRACH trigger, and a window is formed by a plurality of continuous PRACH subframes, and when the PRACH is successfully transmitted in a certain PRACH subframe, k subframes are further separated as the next PRACH transmission window.

Example 4

The embodiment provides a method for configuring PRACH resources on an LAA Scell under Frame structure type3, which can solve the problem of PRACH resource configuration on an unlicensed carrier based on the characteristics of the channel used by the unlicensed carrier based on LBT contention and the characteristics of Frame structure type 3.

The PRACH resource allocation on the LAA Scell is not limited to FDD or TDD modes any more, but is suitable for a resource allocation method in a flexible duplex mode. From the viewpoint of reducing signaling overhead, the configuration indication mode of semi-static PRACH-configIndex+dynamic PRACH Mask Index is still continued, and the configuration method is described below from the time domain and the frequency domain respectively.

In the time domain, considering that there may be a conflict between the PRACH time domain resource configuration and UL LBT before PRACH transmission and a conflict between the PRACH time domain resource configuration and the uplink candidate transmission subframe, the PRACH time domain resource configuration should satisfy the following principles:

1) Semi-static configuration if based on a fixed subframe set configuration, it is desirable to provide as many PRACH candidate subframes as possible, taking into account the uncertainty of the uplink candidate transmission subframes and UL LBT results. The fixed subframe sets may be 10ms/20ms/30ms each, etc., or all 10ms/20ms/30ms satisfying certain requirements, etc.;

2) Semi-static configuration if based on a configuration of a non-fixed set of subframes, the PRACH candidate subframe number configuration may be diversified, e.g., the PRACH candidate subframes may be configured based on an uplink available subframe cluster, where an uplink available subframe cluster refers to 1 or more consecutive subframes that are not used as downlink transmissions for the target cell.

In the frequency domain, the terminal has very little opportunity to obtain the PRACH transmitted on the LAA Scell carrier once, so that not only the time domain multiplexing of a plurality of PRACH but also the frequency domain multiplexing of a plurality of PRACH should be indicated, and then in the PRACH semi-static resource configuration, the supported frequency domain pattern, or the supported frequency domain resource initial position should be indicated.

Determining the PRACH time-frequency resource allocation principle, then an explicit indication method is needed, including the following aspects:

in terms of form, the semi-static high-level signaling indication PRACH-ConfigIndex and the dynamic DCI indication PRACH Mask Index are still inherited;

in the PRACH-ConfigIndex indication, an indication of candidate time-domain resources and candidate frequency-domain resources are to be included in the PRACH transmission, and the order of all candidate time-frequency resource combinations in one Index should be clarified, specifically it may be that all candidate time-frequency resource combinations are listed in order, a time-frequency mapping order may also be specified, for example, first frequency domain then time domain, or first time domain then frequency domain, so that the order of all candidate time-frequency resource combinations may be determined according to the specified mapping order.

Based on the order of all candidate time-frequency resources indicated by the PRACH-ConfigIndex, the PRACH Mask Index indicates that the current PRACH is transmitted using a certain one of the time-frequency resources. Limited to the dynamic UL LBT result and the dynamic uplink candidate transmission subframe, there may be resources unavailable for transmitting PRACH in all candidate time-frequency resources indicated by the PRACH-ConfigIndex, so that the indication of the PRACHMask Index may be more flexible, for example, not in the order of all candidate time-frequency resources, but in the order of available time-frequency resources therein.

Specific example 1:

for PRACH time-frequency resource allocation, a method of combining semi-static PRACH-ConfigIndex configuration with dynamic PRACH Mask Index configuration is still adopted.

For frame structure type Frame structure type, the prach-ConfigIndex configuration contains the following: PRACH Configuration Index, preamble Format, burst, UL Subframe number in Burst, f _RA The specific meanings are explained below.

PRACH Configuration Index: the index number indicating the configuration has a specific value of 0 to X, X being a positive integer.

Preamble Format: and indicating the preamble format sent by the PRACH under the corresponding index sequence number, wherein the value range is set [0 1 2 3 4] or a subset thereof.

Burst: indicating the available Burst range for PRACH transmission under the corresponding index sequence number, wherein the value range is all odd Burst or all even Burst or all Burst.

UL Subframe number in Burst: and indicating a specific subframe in the Burst available for PRACH transmission under the corresponding index sequence number, wherein the value range is set [1 2 … Burst contains the number of subframes ] or a subset thereof.

f _RA : indicating available frequency domain position for PRACH transmission under corresponding index sequence number to calculate related parameters, wherein the value range is set [0 1 … frequency domain configuration candidate number]Or a subset thereof.

An example of a semi-static prach-ConfigIndex configuration is given in table 1 below. Table 1:Frame structure type3random access configuration for preamble formats 0-4

For Frame structure type, the PRACH Mask Index configuration contains the following: the PRACH Mask Index, allowed PRACH, the specific meanings are explained below.

PRACH Mask Index: PRACH Mask index

Allowed PRACH: and under the corresponding PRACH Mask index, the PRACH transmits the usable semi-statically configured PRACH time-frequency resource.

Table 2 below gives an example of a dynamic PRACH Mask Index configuration.

Table 2:Frame structure type3PRACH Mask Index values

According to the settings of tables 1 and 2, for example PRACH Mask index=1, corresponding to PRACH Resource Index 0, indicating the first available candidate resource among all candidate PRACH time-frequency resources configured for the cell semi-static PRACH-ConfigIndex, note that both the time and frequency domains should be considered here, and PRACH Resource Index 0 indicates f at the 1 st uplink subframe of the odd Burst assuming that the cell semi-static PRACH-ConfigIndex is configured to PRACH Configuration Index =7 _RA A frequency domain position of 0, PRACH may be transmitted. PRACH Resource Index 1 f of the 1 st uplink subframe in the odd Burst _RA A frequency domain position of 1, the PRACH may be transmitted. PRACH Resource Index 2 f of the 1 st uplink subframe in the odd Burst _RA The PRACH may be transmitted for a frequency domain position of 2. PRACH Resource Index 3 f of the 2 nd uplink subframe at odd Burst _RA A frequency domain position of 0, PRACH may be transmitted. PRACH Resource Index 4 f of the 2 nd uplink subframe at odd Burst _RA A frequency domain position of 1, the PRACH may be transmitted. PRACH Resource Index 5 is shown at oF of 2 nd uplink subframe of dd Burst _RA A frequency domain position of 2, PRACH may be transmitted, and so on.

Specific example 2:

For Frame structure type, the prach-ConfigIndex configuration contains the following: PRACH Configuration Index, preamble formats, system frame number, UL Subframe number, f _RA The specific meanings are explained below.

System frame number: and indicating the radio frame range available for PRACH transmission under the corresponding index sequence number, wherein the value range is all odd radio frames or all even radio frames or all radio frames.

UL Subframe number: and indicating a specific uplink subframe sequence number in the radio frame available for PRACH transmission under the corresponding index sequence number, wherein the value range is set [0 1 2 3 4 5 6 7 8 9] or a subset thereof. If subframe #3, subframe #4, subframe #5, and subframe #6 in one radio frame are uplink subframes, if the field is configured as [0 1 2], it means that subframe #3, subframe #4, and subframe #5 in the radio frame are PRACH candidate time domain resources. At Frame structure type, the uplink subframes available for uplink transmission in each radio frame may dynamically vary with LBT results and load distribution,

An example of a semi-static prach-ConfigIndex configuration is given in table 3 below.

Table 3:Frame structure type3 random access configuration for preamble formats 0-4

The PRACH Mask Index configuration was the same as example 1 for Frame structure type 3.

According to the configurations of tables 3 and 2, for example PRACH Mask index=1, corresponding to PRACH Resource Index 0, indicating the first available candidate resource among all candidate PRACH time-frequency resources configured for the semi-static PRACH-ConfigIndex of the cell, note that both the time and frequency domains should be considered here, and PRACH Resource Index 0 indicates f in the 1 st uplink subframe of the odd radio frame assuming that the semi-static PRACH-ConfigIndex of the cell is configured to PRACH Configuration Index =7 _RA A frequency domain position of 0, PRACH may be transmitted. PRACH Resource Index 1 f in the 1 st uplink subframe of the odd radio frame _RA A frequency domain position of 1, the PRACH may be transmitted. PRACH Resource Index 2 f in the 1 st uplink subframe of the odd radio frame _RA The PRACH may be transmitted for a frequency domain position of 2. PRACH Resource Index 3 f of the 2 nd uplink subframe in the odd radio frame _RA A frequency domain position of 0, PRACH may be transmitted. PRACH Resource Index 4 f of the 2 nd uplink subframe of the odd radio frame is shown _RA A frequency domain position of 1, the PRACH may be transmitted. PRACH Resource Index 5 f of the 2 nd uplink subframe in the odd radio frame _RA A frequency domain position of 2, PRACH may be transmitted, and so on.

Specific example 3:

For Frame structure type, the prach-ConfigIndex configuration contains the following: PRACH Configuration

Index、Preamble Format、Density Per Burst D _RA 、f _RA The specific meanings are explained below.

Density Per XX ms D _RA : indicating how many times of subframe opportunities to transmit the PRACH are in each XX ms time period, wherein the value is 1/n or n, n is a positive integer, when the value is 1/n, the subframe opportunities to transmit the PRACH are indicated to be 1 time in each n XX ms, and when the value is n, the subframe opportunities to transmit the PRACH are indicated to be n times in each XX ms. XX may be 10 or a positive integer multiple of 10.

An example of a semi-static prach-ConfigIndex configuration is given in table 4 below.

Table 4:Frame structure type3random access configuration for preamble formats 0-4

According to the configurations of tables 4 and 2, for example PRACH Mask index=1, corresponding to PRACH Resource Index 0, the first available candidate resource among all candidate PRACH time-frequency resources configured for the cell semi-static PRACH-ConfigIndex is indicated, note that both the time and frequency domains should be considered here, and PRACH Resource Index indicates that the PRACH is transmitted on the first uplink available subframe of each Burst, assuming that the cell semi-static PRACH-ConfigIndex is configured to PRACH Configuration Index =7.

Example 5

The embodiment of the invention also provides a storage medium. Alternatively, in the present embodiment, the above-described storage medium may be configured to store program code for performing the steps of:

s1, configuring PRACH information of a physical random access channel, wherein the PRACH information comprises at least one of the following types of information:

S2, notifying the PRACH information to the user equipment UE.

Alternatively, in the present embodiment, the storage medium may include, but is not limited to: a U-disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.

Optionally, in this embodiment, the processor performs configuring physical random access channel PRACH information according to program code stored in the storage medium, where the PRACH information includes at least one of the following types of information: first type information for representing information common to the UE in the plurality of timing groups TAGs; a second type of information for representing credits common to a plurality of carriers within each TAG of the UE; third type information for representing information specific to each carrier within each TAG of the UE;

optionally, in this embodiment, the processor performs notifying the PRACH information to the user equipment UE according to a program code stored in the storage medium.

Alternatively, specific examples in this embodiment may refer to examples described in the foregoing embodiments and optional implementations, and this embodiment is not described herein.

It will be appreciated by those skilled in the art that the modules or steps of the invention described above may be implemented in a general purpose computing device, they may be concentrated on a single computing device, or distributed across a network of computing devices, they may alternatively be implemented in program code executable by computing devices, so that they may be stored in a memory device for execution by computing devices, and in some cases, the steps shown or described may be performed in a different order than that shown or described, or they may be separately fabricated into individual integrated circuit modules, or multiple modules or steps within them may be fabricated into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for notifying PRACH information, comprising:

The base station configures physical random access channel PRACH information, wherein the PRACH information comprises at least one of the following types of information:

first type information for representing information common to the UE in the plurality of timing groups TAGs;

a second type of information for representing credits common to a plurality of carriers within each TAG of the UE; third type information for representing information specific to each carrier within each TAG of the UE;

the base station informs the PRACH information to User Equipment (UE);

wherein the first type of information includes at least one of: type information supported by PRACH, and indication information of the PRACH by the UE at a plurality of TAGs; and/or, the second type of information comprises PRACH sequence information; and/or, the third type of information includes at least one of: PRACH subframe configuration information, physical resource block PRB resource configuration information of a frequency domain.

2. The method of claim 1, wherein the PRACH information further comprises at least one of: a starting Orthogonal Frequency Division Multiplexing (OFDM) symbol of a Physical Random Access Channel (PRACH), an ending OFDM symbol of the PRACH, and a PRACH transmission mode, wherein the PRACH transmission mode comprises one of the following steps: the same PRACH sequence is repeatedly transmitted for each symbol in the LTE scheme.

3. The method of claim 2, wherein when the PRACH information further includes a starting OFDM symbol of the PRACH, after the base station informs the UE of the PRACH information, the method further comprises: and before the starting OFDM symbol transmits the PRACH, the UE detects and determines that the channel is in an idle state.

4. The method of claim 2, wherein the PRACH start OFDM symbol when the base station is configured in a full subframe comprises: symbol 0, 1, or symbol 0, 1, 2; or alternatively, the first and second heat exchangers may be,

the PRACH start OFDM symbol includes one of: symbols 11, 9, 7, 5.

5. The method of claim 2, wherein the starting OFDM symbol of the PRACH comprises one of: and transmitting the PRACH from a starting time point of the starting OFDM symbol, and transmitting the PRACH from a middle sample point of the starting OFDM symbol.

6. The method of claim 2, wherein the ending OFDM symbol of the PRACH comprises a symbol in which an ending position of a guard interval GT in the PRACH is located, wherein the ending position of GT comprises one of: and the ending time point of the ending OFDM symbol and the appointed sample point in the ending OFDM symbol.

7. The method of claim 2, wherein the PRACH transmission scheme comprises one of: when the PRACH is transmitted, a plurality of OFDM symbols of the PRACH repeatedly transmit the same PRACH sequence; in PRACH transmission, a plurality of OFDM symbols of PRACH continuously transmit one PRACH sequence.

8. The method of claim 2, wherein PRACH information is configured as information specifying DCI, wherein the specifying DCI is transmitted as downlink grant information or is transmitted as uplink grant information.

9. The method according to any of claims 1 to 8, wherein the base station informs the UE of the PRACH information by at least one of:

10. The method according to any one of claims 1 to 8, wherein the base station informing the UE of the PRACH information comprises:

the base station informs the PRACH information to the UE by using a physical hybrid automatic repeat request indicator channel PHICH defined in an LTE system.

11. A method for transmitting PRACH information, comprising:

receiving PRACH information configured by a base station;

transmitting the PRACH information on an unlicensed carrier;

wherein the PRACH information includes at least one of: first type information for representing information common to the UE in the plurality of timing groups TAGs; a second type of information for representing credits common to a plurality of carriers within each TAG of the UE; third type information for representing information specific to each carrier within each TAG of the UE;

12. The method of claim 11, wherein the PRACH information further comprises at least one of: a starting OFDM symbol of the PRACH, an ending OFDM symbol of the PRACH, and a PRACH transmission mode, wherein the PRACH transmission mode comprises one of the following steps: the same PRACH sequence is repeatedly transmitted for each symbol in the LTE scheme.

13. A PRACH information notification apparatus, comprising:

a configuration module, configured to configure physical random access channel PRACH information, where the PRACH information includes at least one of the following types of information:

a notification module, configured to notify the user equipment UE of the PRACH information;

14. A PRACH information transmitting apparatus, comprising:

the receiving module is used for receiving PRACH information configured by the base station;

a sending module, configured to send the PRACH information on an unlicensed carrier;