CN109587766B - On-demand system information request response and receiving method and device, and base station - Google Patents
On-demand system information request response and receiving method and device, and base station Download PDFInfo
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- CN109587766B CN109587766B CN201710896855.0A CN201710896855A CN109587766B CN 109587766 B CN109587766 B CN 109587766B CN 201710896855 A CN201710896855 A CN 201710896855A CN 109587766 B CN109587766 B CN 109587766B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
An on-demand system information request response method, an on-demand system information request receiving device and a base station are provided, wherein the on-demand system information request response method comprises the following steps: receiving an on-demand system information request sent by at least one user equipment by using a message 3, wherein the on-demand system information request comprises an on-demand system information type, and an uplink resource of the message 3 is indicated in a random access response message acquired by the at least one user equipment by using a lead code and a physical random access channel resource; configuring downlink control information so that the downlink control information carries a feedback message and indicates that the downlink control information is requested for the on-demand system information, wherein the feedback message comprises a received on-demand system information type; and sending the downlink control information through a downlink physical control channel. The technical scheme of the invention can realize the response of the system information request on demand and avoid the collision between the request system information on demand and normal random access.
Description
Technical Field
The invention relates to the technical field of communication, in particular to an on-demand system information request responding method, an on-demand system information request receiving method, an on-demand system information request responding device and an on-demand system information request receiving device, and a base station.
Background
Competitive access and non-competitive random access procedures are supported in both Long Term Evolution (LTE) and New Radio (NR) systems.
In LTE contention random access, as shown in fig. 1, the whole process includes the following steps: s1: random access preamble (preamble) transmission; s2: receiving a random access response; s3: message 3(Msg3) transmission; s4: message 4(Msg4) contends for resolution. In step S1, the method is mainly used to notify the base station (eNodeB) that there is a random access request, and at the same time, enable the base station to estimate the transmission delay between the eNodeB and the User Equipment (UE), and calibrate the uplink timing according to the estimated transmission delay, and indicate the uplink timing to the UE through a random access response message. In step S2, the Random access response message is transmitted through a resource location indicated by a Physical Downlink Control Channel (PDCCH) scrambled by a Random Radio Network Temporary Identity (RA-RNTI). The time-frequency position of the lead code determines the value of RA-RNTI; after the UE transmits the preamble, it monitors a corresponding PDCCH according to the RA-RNTI value within a Random Access Response (RAR) time window to receive a Random Access Response of the corresponding RA-RNTI. If the RAR replied by the base station is not received in the RAR time window, the random access process is considered to fail. The random access response message includes a time adjustment amount required for specifying uplink synchronization of the UE, an uplink resource for the UE to transmit the message 3, and a Temporary Cell Radio Network Temporary Identifier (TC-RNTI). The C-RNTI is used for subsequent transmissions by the UE and the base station, and after collision resolution, the value becomes the C-RNTI.
In step S3, Msg3 is transmitted on the uplink Synchronization Channel (UL-SCH), and Msg3 needs to contain important information: a unique flag per UE. This flag will be used for conflict resolution at step S4. For the UE in the connected state, the only mark is C-RNTI; for the UE in the non-connected state, a unique UE Identity (Serving Temporary Mobile Subscriber Identity (S-TMSI)) from the core network or a random number is used as its Identity. In step S4, the UE has a flag carrying its own unique flag at Msg 3: C-RNTI or UE flag from core network. The base station will carry this unique flag in Msg4 to designate the winning UE in the collision resolution mechanism, while other UEs that are not winning in collision resolution will re-initiate random access. If the PDCCH received by the UE in Msg4 is scrambled by the TC-RNTI specified in the RAR, when a Contention Resolution Identity MAC Control element (Contention Resolution Identity MAC Control element) of the UE included in a successfully decoded Media Access Control (MAC) layer Protocol Data Unit (PDU) matches a Service Data Unit (SDU) of a Common Control Channel (CCCH) sent by Msg3, the UE considers that the random Access is successful and sets its TC-RNTI to be the C-RNTI.
In NR systems, contention random access may be employed for on-demand system information requests. According to the current conference discussion, the idle state UE or the inactive state UE may employ a message 1(Msg1-based) or a message 3(Msg 3-based) based on-demand system information request. If the base station transmits the random access resource used by the on-demand system information request through the system information broadcast, the UE considers that the request message is to be transmitted through the message 1-based scheme. Otherwise the UE considers that the request message is to be sent by the message 3 based approach. At this time, the Random Access resources (Physical Random Access Channel (PRACH) preamble and PRACH time-frequency resources) used by the UE to send Msg1 are shared with the Random Access resources used by the normal Access UE to send Msg 1. The UE is to confirm whether the transmission of the message 3(Msg3) is successful by receiving a response message sent by the base station. The on-demand system information to be requested may be indicated to the base station in the form of a bit map (bitmap) by a message 3, each bit (bit) representing a specified one or more of the on-demand system information. When idle state or inactive state UE sends request message of system information on demand by using message 3, if there are other UEs using lead code and random access resource to access, then collision will occur when sending message 3, and the base station can identify whether the received message 3 is for accessing or requesting system information on demand by using the received message 3, and then sends corresponding response message.
However, in the NR system, if the UE transmits the message 3 only to request the on-demand system information, it is not necessary to perform a contention resolution procedure. Because the UE sending the on-demand system information request message uses the common random access resource to send the message 3 in the random access process, the UE may collide with the UE accessing normally when sending the message 3, and if the LTE mechanism is used, the UE may be decoded incorrectly, thereby causing a failure in the process.
Disclosure of Invention
The invention solves the technical problem of how to realize the response of the request of the system information on demand and avoid the collision between the request of the system information on demand and random access.
To solve the foregoing technical problem, an embodiment of the present invention provides an on-demand system information request response method, including: receiving an on-demand system information request sent by at least one user equipment by using a message 3, wherein the on-demand system information request comprises an on-demand system information type, and an uplink resource of the message 3 is indicated in a random access response message acquired by the at least one user equipment by using a lead code and a physical random access channel resource; configuring downlink control information so that the downlink control information carries a feedback message and indicates that the downlink control information is requested for the on-demand system information, wherein the feedback message comprises a received on-demand system information type; and sending the downlink control information through a downlink physical control channel.
Optionally, the configuring the downlink control information, so that the downlink control information carries a feedback message and indicates that the downlink control information is for the on-demand system information request includes: using downlink control information with a format different from that of the downlink control information used for contention resolution to carry the feedback message; or configuring identification information and the feedback message in downlink control information for contention resolution, where the identification information is used to indicate that the downlink control information is requested for the on-demand system information.
Optionally, the identification information is a newly added bit in the downlink control information.
Optionally, the configuring, in the downlink control information for contention resolution, the identification information and the feedback message includes: configuring the value of the newly added bit as a first preset value, and configuring the downlink control information to carry the feedback message aiming at the on-demand system information request; and when the value of the newly added bit is configured to be a second preset value, the downlink control information carries resource indication information of a contention resolution MAC control unit.
The embodiment of the invention also discloses an on-demand system information request response receiving method, which comprises the following steps: sending an on-demand system information request to a base station by using a message 3, wherein the on-demand system information request comprises an on-demand system information type, and an uplink resource of the message 3 is indicated in a random access response message acquired by using a lead code and a physical random access channel resource; blind-detecting a downlink physical control channel sent by the base station to obtain the downlink control information; if the downlink control information indicates that a feedback message is requested for the on-demand system information, receiving a feedback message carried by the downlink control information, wherein the feedback message comprises the type of the on-demand system information received by the base station; and if the on-demand system information types in the feedback message comprise all on-demand system information types in the on-demand system information request, determining that the message 3 is transmitted successfully.
Optionally, the on-demand system information request response receiving method further includes: if the on-demand system information type in the feedback message includes part of the on-demand system information type in the on-demand system information request or does not include the on-demand system information type in the on-demand system information request, determining that the message 3 fails to transmit, and retransmitting the on-demand system information type in the on-demand system information request or the on-demand system information type not included in the feedback message.
Optionally, if the downlink control information indicates that the feedback message is for the on-demand system information request, receiving the downlink control information bearer feedback message includes: receiving the feedback message if the base station uses downlink control information with a format different from that of the downlink control information used for contention resolution to carry the feedback message; or, obtaining a feedback message carried by the downlink control information according to identification information in the downlink control information, where the identification information is used to indicate that the downlink control information is requested by the base station for the received on-demand system information.
Optionally, the identification information is a newly added bit in the downlink control information.
Optionally, the obtaining, according to the identification information in the downlink control information, a feedback message carried by the downlink control information includes: if the value of the newly added bit is a first preset value, receiving the feedback message which is carried by the downlink control information and aims at the system information request on demand; and when the value of the newly added bit is configured to be a second preset value, the downlink control information carries resource indication information of a contention resolution MAC control unit.
The embodiment of the invention also discloses an on-demand system information request response device, which comprises: an on-demand system information request receiving module adapted to receive an on-demand system information request sent by at least one user equipment using a message 3, the on-demand system information request including an on-demand system information type, an uplink resource of the message 3 being indicated in a random access response message acquired by the at least one user equipment using a preamble and a physical random access channel resource; a downlink control information configuration module, adapted to configure downlink control information so that the downlink control information carries a feedback message and indicates that the downlink control information is requested for the on-demand system information, the feedback message including a type of the received on-demand system information; and the downlink control information sending module is suitable for sending the downlink control information out through a downlink physical control channel.
Optionally, the downlink control information configuring module includes: a first configuration unit, adapted to use downlink control information with a format different from that of downlink control information used for contention resolution to carry the feedback message; a second configuration unit, adapted to configure identification information and the feedback message in downlink control information for contention resolution, where the downlink control information is the identification information for the on-demand system information request and is used to indicate that the downlink control information is for the on-demand system information request.
Optionally, the identification information is a newly added bit in the downlink control information.
Optionally, the second configuration unit configures the value of the newly added bit to be a first preset value, and configures the downlink control information to carry the feedback message for the on-demand system information request; and when the value of the newly added bit is configured to be a second preset value, the downlink control information carries resource indication information of a contention resolution MAC control unit.
The embodiment of the invention also discloses an on-demand system information request response receiving device, which comprises: an on-demand system information request sending module adapted to send an on-demand system information request to a base station using a message 3, the on-demand system information request including an on-demand system information type, an uplink resource of the message 3 being indicated in a random access response message acquired using a preamble and a physical random access channel resource; a downlink control information acquisition module, adapted to blindly detect a downlink physical control channel sent by the base station to obtain the downlink control information; a feedback message receiving module, adapted to receive a downlink control information bearer feedback message when the downlink control information indicates that a feedback message is for the on-demand system information request, where the feedback message includes an on-demand system information type received by the base station; a first transmission determining module adapted to determine that the message 3 is successfully transmitted when the on-demand system information type in the feedback message includes all on-demand system information types in the on-demand system information request.
Optionally, the on-demand system information request response receiving apparatus further includes: a second transmission determining module, adapted to determine that transmission of the message 3 fails when the on-demand system information type in the feedback message includes a part of the on-demand system information type in the on-demand system information request or does not include the on-demand system information type in the on-demand system information request, and retransmit the on-demand system information type in the on-demand system information request or the on-demand system information type not included in the feedback message.
Optionally, the feedback message receiving module includes: a first receiving unit, adapted to receive the feedback message when the base station uses downlink control information with a format different from that of downlink control information used for contention resolution to carry the feedback message; a second receiving unit, adapted to obtain a feedback message carried by the downlink control information when the downlink control information includes identification information, where the identification information is used to indicate that the downlink control information is requested by the base station for the received on-demand system information.
Optionally, the identification information is a newly added bit in the downlink control information.
Optionally, when the value of the newly added bit is a first preset value, the second receiving unit receives the feedback message, which is carried by the downlink control information and is directed to the on-demand system information request; and when the value of the newly added bit is configured to be a second preset value, the downlink control information carries resource indication information of a contention resolution MAC control unit.
The embodiment of the invention also discloses a storage medium, which stores computer instructions, and the computer instructions execute the steps of the on-demand system information request response method or the steps of the on-demand system information request response receiving method when running.
The embodiment of the invention also discloses a base station, which comprises a memory and a processor, wherein the memory is stored with computer instructions capable of running on the processor, and the processor executes the steps of the on-demand system information request response method when running the computer instructions.
The embodiment of the invention also discloses user equipment which comprises a memory and a processor, wherein the memory is stored with a computer instruction which can be operated on the processor, and the processor executes the step of the on-demand system information request response receiving method when operating the computer instruction.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
in the technical scheme of the invention, an on-demand system information request sent by at least one user equipment by using a message 3 is received, the on-demand system information request comprises an on-demand system information type, and an uplink resource of the message 3 is indicated in a random access response message acquired by the at least one user equipment by using a lead code and a physical random access channel resource; configuring downlink control information so that the downlink control information carries a feedback message and indicates that the downlink control information is requested for the on-demand system information, wherein the feedback message comprises a received on-demand system information type; and sending the downlink control information through a downlink physical control channel. In the technical scheme of the invention, a base station configures downlink control information, so that the downlink control information can bear feedback information and indicate that the downlink control information is requested by aiming at the on-demand system information; the user equipment can identify and obtain the feedback information after obtaining the downlink control information through blind detection, response of the system information request on demand is realized, and collision between the system information request on demand and random access is avoided; in addition, unnecessary receiving and decoding of the physical downlink shared channel can be avoided, and the power consumption of the UE can be reduced.
Further, the configuring the downlink control information so that the downlink control information carries a feedback message and indicates that the downlink control information is for the on-demand system information request includes: using downlink control information with a format different from that of the downlink control information used for contention resolution to carry the feedback message; or configuring identification information and the feedback message in downlink control information for contention resolution, where the downlink control information is the identification information for the on-demand system information request and is used to indicate that the downlink control information is for the on-demand system information request. The technical scheme of the invention can implicitly indicate that the feedback message of the user equipment is requested by the on-demand system information through the downlink control information with a format different from that of the downlink control information used for contention resolution; the user equipment feedback message can be directly indicated to be requested for the on-demand system information through the identification information; the flexibility of downlink control information indication is realized.
Drawings
FIG. 1 is a flow chart of an on-demand system information request response method according to an embodiment of the present invention;
fig. 2 is a flowchart of an on-demand system information request response receiving method according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an on-demand system information request responding apparatus according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an on-demand system information request response receiving apparatus according to an embodiment of the present invention.
Detailed Description
As described in the background art, in the NR system, if the UE transmits the message 3 only to request the on-demand system information, it is not necessary to perform a contention resolution procedure. Because the UE sending the on-demand system information request message uses the common random access resource to send the message 3 in the random access process, the UE may collide with the UE accessing normally when sending the message 3, and if the LTE mechanism is used, the UE may be decoded incorrectly, thereby causing a failure in the process.
Therefore, it is highly desirable to design a response mechanism for the on-demand system information request, so as to implement the response of the on-demand system information request by using the message 3 and avoid the collision between the request of the on-demand system information and the random access.
In the technical scheme of the invention, a base station configures downlink control information, so that the downlink control information can bear feedback information and indicate that the downlink control information is requested by aiming at the on-demand system information; the user equipment can identify and obtain the feedback information after obtaining the downlink control information through blind detection, response of the system information request on demand is realized, and collision between the system information request on demand and random access is avoided; in addition, unnecessary receiving and decoding of the physical downlink shared channel can be avoided, and the power consumption of the UE can be reduced.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 is a flowchart of an on-demand system information request response method according to an embodiment of the present invention.
The on-demand system information request response method shown in fig. 1 may be used for a base station side, and the on-demand system information request response method may include the following steps:
step S101: receiving an on-demand system information request sent by at least one user equipment by using a message 3, wherein the on-demand system information request comprises an on-demand system information type, and an uplink resource of the message 3 is indicated in a random access response message acquired by the at least one user equipment by using a lead code and a physical random access channel resource;
step S102: configuring downlink control information so that the downlink control information carries a feedback message and indicates that the downlink control information is requested for the on-demand system information, wherein the feedback message comprises a received on-demand system information type;
step S103: and sending the downlink control information through a downlink physical control channel.
In this embodiment, at least one ue may send an on-demand system information request using a message 3, where uplink resources of the message 3 are indicated in a random access response message acquired by the at least one ue using a preamble and a physical random access channel resource. Further, the preamble and the physical random access channel resource may also be used for the UE to perform a random access procedure. That is, the UE may perform a random access procedure using the preamble and the physical random access channel resources; then the UE may send the UE identity with message 3 for contention resolution.
Specifically, the UE in the idle state or the inactive state may send the on-demand system information request through the message 3 in the random access process by using the common random access resource, that is, the PRACH preamble and the PRACH time-frequency resource. The network side transmits a feedback message containing all received on-demand system message types as a response message of the received message 3.
In the specific implementation of step S101, the base station may receive an on-demand system information request sent by the user equipment, so as to obtain the type of the on-demand system information requested by the user equipment. For example, the on-demand System Information type may be selected from System Information (SI) 1, SI2, SI3, SI4, SI5 …, SI10, and the like. Specifically, the type of the on-demand system information in the message 3 may be in the form of bitmap.
Further, in the specific implementation of step S102, the base station configures Downlink Control Information (DCI) so that the Downlink Control Information not only can carry a feedback message, but also can indicate that the Downlink Control Information is requested for the on-demand system Information. After the configuration of the downlink control information is completed, in step S103, the base station sends out the downlink control information.
That is, after receiving the DCI, the user equipment may know whether the feedback message is requested for the on-demand system information according to the indication of the DCI. If so, the UE can acquire the type of the on-demand system information received by the base station through the type of the on-demand system information in the feedback message, so that the UE can judge whether the message 3 is successfully sent.
Specifically, the base station may send the downlink control information through the PDCCH. Therefore, the UE can blindly detect the PDCCH to obtain the downlink control information and obtain the feedback information carried by the downlink control information. More specifically, the base station transmits the downlink control information through the PDCCH scrambled with the temporary C-RNTI.
In the embodiment of the invention, a base station configures downlink control information, so that the downlink control information can bear feedback information and indicate that the downlink control information is requested by aiming at the on-demand system information; the user equipment can identify and obtain the feedback information after obtaining the downlink control information through blind detection, response of the system information request on demand is realized, and collision between the system information request on demand and random access is avoided; in addition, unnecessary receiving and decoding of a Physical Downlink Shared Channel (PDSCH) can be avoided, and power consumption of the UE can be reduced.
Preferably, step S102 may include the steps of: and using downlink control information with a format different from that of the downlink control information used for contention resolution to carry the feedback message.
In the downlink control information used for contention resolution, the format (format) and corresponding function of the downlink control information are fixed, and after receiving the downlink control information, the ue may determine the function according to the format of the downlink control information. For example, the downlink control information formatted as format0 has a function of scheduling a Physical Uplink Shared Channel (PUSCH).
In this embodiment, the base station uses downlink control information with a format different from that of the downlink control information used for contention resolution to carry the feedback message. That is to say, the downlink control information carrying the feedback message is in a new format, and the new format enables the UE side to distinguish that the feedback message is requested for the on-demand system information. The format of the downlink control information used for contention resolution enables the UE side to distinguish the resource location of the contention resolution MAC control unit carried by the downlink control information.
Further, the number of bits of the downlink control information with a format different from that of the downlink control information used for contention resolution may be determined according to the number of types of the on-demand system information that actually need to be requested, and may include 32 bits, for example.
Preferably, step S102 may include the steps of: configuring identification information and the feedback message in downlink control information for contention resolution, where the downlink control information is the identification information for the on-demand system information request and is used to indicate that the downlink control information is for the on-demand system information request.
In this embodiment, the format of the downlink control information may be a format of downlink control information used for contention resolution. By configuring the identification information in the downlink control information, the UE can distinguish whether the feedback message is requested for the on-demand system information or whether the downlink control information carries the resource location of the contention resolution MAC control unit. The downlink control information may include a feedback message in addition to the identification information.
Further, the identification information is a newly added bit in the downlink control information.
In this embodiment, in addition to the bits occupied by the format of the downlink control information in the LTE system, new bits are added to the downlink control information to serve as identification information to indicate whether the feedback message is for the on-demand system information request. It is understood that the newly added bit may be one bit, or may be any other implementable number of bits.
Further, when configuring identification information and the feedback message in downlink control information for contention resolution, the base station configures the value of the newly added bit to be a first preset value, and configures the downlink control information to carry the feedback message for the on-demand system information request.
In specific implementation, the base station configures the value of the newly added bit to be 1, and the corresponding DCI remaining bits are feedback messages and configured in a bit mapping (bitmap) form. For example, if the type of the system information received by the base station is SI2, SI4, SI5, and SI8, the base station may use DCI with an existing format and set the value of the new bit to 1, and the remaining bits to 0101100100.
Specifically, when the value of the newly added bit is configured as a second preset value, the downlink control information carries resource indication information of a contention resolution MAC control unit. In a random access scenario, the downlink control information needs to carry resource indication information of a contention resolution MAC control element, and at this time, the base station may configure the value of the newly added bit to be a second preset value different from the first preset value.
It can be understood that the first preset value may also be 0, and then the second preset value is 1, which is not limited in this embodiment of the present invention.
In the embodiment of the invention, the base station directly indicates the received system information request on demand through the PDCCH DCI, so that the UE can confirm whether the received content is the content required to be received after receiving the PDCCH, unnecessary PDSCH receiving and decoding are avoided, and the power consumption of the UE can be reduced.
Preferably, the feedback message further comprises at least one historically received on-demand system information type.
In this embodiment, the base station may configure the feedback message for the currently received on-demand system information request and the currently and previously received on-demand system information request together, so as to save downlink signaling and improve transmission efficiency. For example, when the base station currently receives the on-demand system information request of the UE1 for S12 and SI4, and the base station already receives the on-demand system information requests for SI5 and SI8 sent by other UEs before receiving the on-demand system information request, the base station configures the feedback message to 0101100100 when receiving the on-demand system information request sent by the UE 1.
Fig. 2 is a flowchart of an on-demand system information request response receiving method according to an embodiment of the present invention.
The on-demand system information request response receiving method shown in fig. 2 may be used in a user equipment side, and the on-demand system information request response receiving method may include the following steps:
step S201: sending an on-demand system information request to a base station by using a message 3, wherein the on-demand system information request comprises an on-demand system information type, and an uplink resource of the message 3 is indicated in a random access response message acquired by using a lead code and a physical random access channel resource;
step S202: blind-detecting a downlink physical control channel sent by the base station to obtain the downlink control information;
step S203: receiving a downlink control information bearer feedback message if the downlink control information indicates that the feedback message is for the on-demand system information request, wherein the feedback message comprises an on-demand system information type received by the base station;
step S204: and if the on-demand system information types in the feedback message comprise all on-demand system information types in the on-demand system information request, determining that the message 3 is transmitted successfully.
In this embodiment, at least one ue sends an on-demand system information request to the base station through step S201 to notify the base station of the type of the on-demand system information requested by the ue. Before step S201, the at least one ue further uses the same physical random access channel resource to send a preamble to the base station; and the base station sends the uplink resource of the message 3 to the at least one user equipment based on the preamble and the physical random access channel resource, so that the at least one user equipment can send the message 3.
Further, in step S202, the ue may acquire downlink control information through a blind PDCCH.
After receiving the downlink control information, in step S203, the ue determines whether to receive the feedback message according to the indication of the downlink control information. If so, in step S204, the on-demand system information type received by the base station in the feedback message is compared with the on-demand system information type in the on-demand system information request, and if the on-demand system information type in the feedback message includes all on-demand system information types in the on-demand system information request, it is determined that the message 3 is successfully transmitted. If the downlink control information indicates that the feedback message is not for the on-demand system information request, and the resource location of the contention resolution MAC control element is carried in the downlink control information, it may be determined that the transmission of the message 3 fails, and the on-demand system information type in the on-demand system information request or the on-demand system information type not included in the feedback message may be retransmitted.
In the technical scheme of the invention, the downlink control information can bear feedback information and indicate that the downlink control information is requested by the on-demand system information; the user equipment can identify and obtain the feedback information after obtaining the downlink control information through blind detection, response of the system information request on demand is realized, and collision between the system information request on demand and random access is avoided; in addition, unnecessary receiving and decoding of the physical downlink shared channel can be avoided, and the power consumption of the UE can be reduced.
The receiving method shown in fig. 2 may further include the steps of: if the on-demand system information type in the feedback message includes part of the on-demand system information type in the on-demand system information request or does not include the on-demand system information type in the on-demand system information request, determining that the message 3 fails to transmit, and retransmitting the on-demand system information type in the on-demand system information request or the on-demand system information type not included in the feedback message.
In this embodiment, since the feedback message configured by the base station may be directed to multiple on-demand system information requests, and the feedback message may include multiple on-demand system information types, a situation may occur in which the on-demand system information type received by the base station includes a part of the on-demand system information types in the on-demand system information request. In this case, indicating that the transmission of message 3 failed, the user equipment needs to retransmit message 3. Specifically, the user equipment needs to retransmit the on-demand system information type in the on-demand system information request or the on-demand system information type not included in the feedback message.
For example, when the type of the on-demand system information received by the base station is SI2, SI4, SI5, and SI8, and the type of the on-demand system information in the on-demand system information request of the UE1 is SI9, the transmission of the message 3 of the UE1 fails, the UE1 needs to retransmit the message 3, and the message 3 includes the system information SI 9.
Further, step S203 shown in fig. 2 may include the following steps: receiving the feedback message if the base station uses downlink control information with a format different from that of the downlink control information used for contention resolution to carry the feedback message; otherwise, it is determined that the message 3 fails to be transmitted, and the on-demand system information type in the on-demand system information request or the on-demand system information type not included in the feedback message is retransmitted.
Or, obtaining a feedback message carried by the downlink control information according to identification information in the downlink control information, where the identification information is used to indicate that the downlink control information is requested by the base station for the received on-demand system information.
Further, if the value of the newly added bit is a first preset value, receiving the feedback message carried by the downlink control information and aiming at the on-demand system information request; otherwise, it is determined that the message 3 fails to be transmitted, and all on-demand system information types in the on-demand system information request or on-demand system information types not included in the feedback message are retransmitted.
For more detailed implementation of steps S201 to S204, reference may be made to the embodiment shown in fig. 1, which is not described herein again.
In a specific application scenario of the present invention, UE1, UE2, and UE4 are required to perform system information request on demand, and UE3 is required to perform normal access procedure to establish connection with the network. The UE1 needs to request on-demand system information SI2 and S14, the UE2 needs to request on-demand system information SI2, SI4 and SI8, and the UE4 needs to request on-demand system information SI 9. The UE1, the UE2 and the UE4 adopt an Msg3-based mechanism for transmission of the on-demand system information request message. The bit length of the message 3 transmission request on-demand system information is 10 bits.
The UE1, the UE2, the UE3, and the UE4 select a preamble and a PRACH time-frequency resource in a common random access resource pool, and transmit the selected preamble on the selected PRACH resource.
The base station receives the lead code on the PRACH resource, and can not identify the UE, and the base station acquires a corresponding Random access Radio Network Temporary Identity (RA-RNTI) according to the PRACH resource and assembles a Random access response message. And the base station indicates the transmission resource of the random access response message by the calculated RA-RNTI scrambled PDCCH. And indicating the received lead code information in a subheader of a random access response message MAC PDU, wherein the random access response message MAC SDU carries the temporary C-RNTI and uplink resources used for sending the message 3.
UE1, UE2, UE3 and UE4 receive a random access response message transmitted on a resource location indicated by the PDCCH scrambled with the RA-RNTI and transmit message 3 on the resource location indicated in the message.
Wherein, the UE1 indicates the request information of the on-demand system information SI2 and S14 in the message 3, and the corresponding bitmap is set to 0101000000;
the UE2 indicates the request information of the on-demand system information SI2, SI4, and SI8 in message 3, and the corresponding bitmap is set to 0101000100;
the UE3 indicates an initial RRC connection establishment request in message 3, where the message carries a UE identity, which is 40bits, for example, S-TMSI;
the UE4 indicates the request information of the on-demand system information SI9 in message 3, with the corresponding bitmap set to 00000010.
UE1, UE2, UE3, and UE4 send respective Msg3 messages on the same resource, and the base station can typically only receive data sent from one UE. In this embodiment, the base station receives the message 3 sent from the UE2, and the base station needs to send corresponding feedback information to the UE 2. UE1, UE2, UE3, and UE4 need to identify the feedback information sent by the base station.
Wherein, the base station may adopt the new DCI format to carry the feedback message 0101100100. The new DCI format is different from the DCI format of the LTE system.
UE1, UE2, and UE4 monitor the new DCI format PDCCH scrambled with the temporary C-RNTI, wherein the feedback message contains SI2 and SI4 requested by UE1 and UE2, and SI8 requested by UE2, but does not contain SI9 information requested by UE4, then UE1 and UE2 confirm that message 3 transmission was successful, and UE4 confirms that message 3 transmission failed.
The UE3 listens to the existing DCI format PDCCH scrambled with the temporary C-RNTI and does not, then the UE3 determines that the message 3 transmission failed and the UE3 needs to retransmit the message 3 including the UE identity.
The base station may also adopt the existing DCI and add a value of bit (flag) field. When the newly added bit is set to 0, the corresponding DCI residual bit is the resource indication information, and if the newly added bit is set to 1, the corresponding DCI residual bit is the feedback message. The base station uses the existing DCI and sets the value of the new bit to 1 and the remaining bits to 0101100100.
UE1, UE2, and UE4 monitor PDCCH scrambled with temporary C-RNTI, confirm that the value of the newly added bit is set to 1 and the remaining bits are set to 0101100100, confirm that SI2 and SI4 requested by UE1 and UE2 and SI8 requested by UE2 are already included but SI9 information requested by UE4 is not included, UE1 and UE2 confirm that message 3 transmission is successful and UE4 confirms that message 3 transmission is failed.
The UE3 monitors the PDCCH scrambled with the temporary C-RNTI and confirms that the value of the new added bit is set to 1, then it is considered that the message 3 transmission has failed and the UE3 needs to retransmit the message 3 including the UE identity.
The embodiments of the present invention are merely exemplary descriptions, and do not limit the technical solutions of the present invention.
Fig. 3 is a schematic structural diagram of an on-demand system information request responding apparatus according to an embodiment of the present invention.
The on-demand system information request responding apparatus 30 shown in fig. 3 may be used on the base station side, and the on-demand system information request responding apparatus 30 includes an on-demand system information request receiving module 301, a downlink control information configuring module 302, and a downlink control information transmitting module 303.
The on-demand system information request receiving module 301 is adapted to receive an on-demand system information request sent by at least one user equipment by using a message 3, where the on-demand system information request includes an on-demand system information type, and an uplink resource of the message 3 is indicated in a random access response message acquired by the at least one user equipment by using a preamble and a physical random access channel resource;
the downlink control information configuring module 302 is adapted to configure downlink control information so that the downlink control information carries a feedback message and indicates that the downlink control information is requested for the on-demand system information, where the feedback message includes a type of the received on-demand system information;
the downlink control information sending module 303 is adapted to send the downlink control information through a downlink physical control channel.
In the embodiment of the invention, a base station configures downlink control information, so that the downlink control information can bear feedback information and indicate that the downlink control information is requested by aiming at the on-demand system information; the user equipment can identify and obtain the feedback information after obtaining the downlink control information through blind detection, response of the system information request on demand is realized, and collision between the system information request on demand and random access is avoided; in addition, unnecessary receiving and decoding of the physical downlink shared channel can be avoided, and the power consumption of the UE can be reduced.
Preferably, the downlink control information configuration module 302 may include a first configuration unit 3021 and a second configuration unit 3022. Wherein, the first configuration unit 3021 is adapted to use downlink control information with a format different from that of the downlink control information for contention resolution to carry the feedback message; the second configuration unit 3022 is adapted to configure identification information and the feedback message in downlink control information for contention resolution, the downlink control information being the identification information for the on-demand system information request for indicating that the downlink control information is for the on-demand system information request.
Further, the second configuring unit 3022 configures the value of the newly added bit to be a first preset value, and configures the downlink control information to carry the feedback message for the on-demand system information request; wherein, when the value of the newly added bit is configured as a second preset value, the downlink control information carries resource indication information of a contention resolution MAC control unit
For more details on the operation principle and the operation mode of the on-demand system information request responding apparatus 30, reference may be made to the relevant descriptions in fig. 1 to fig. 2, and details are not repeated here.
Fig. 4 is a schematic structural diagram of an on-demand system information request response receiving apparatus according to an embodiment of the present invention.
The on-demand system information request response receiving apparatus 40 shown in fig. 4 may be used on the user equipment side, and the on-demand system information request response receiving apparatus 40 may include an on-demand system information request sending module 401, a downlink control information obtaining module 402, a feedback message receiving module 403, and a first transmission determining module 404.
The on-demand system information request sending module 401 is adapted to send an on-demand system information request to a base station by using a message 3, where the on-demand system information request includes an on-demand system information type, and an uplink resource of the message 3 is indicated in a random access response message acquired by using a preamble and a physical random access channel resource;
the downlink control information obtaining module 402 is adapted to blindly detect a downlink physical control channel sent by the base station to obtain the downlink control information;
the feedback message receiving module 403 is adapted to receive a downlink control information bearer feedback message when the downlink control information indicates that a feedback message is for the on-demand system information request, where the feedback message includes an on-demand system information type received by the base station;
the first transmission determination module 404 is adapted to determine that the message 3 is successfully transmitted when the on-demand system information type in the feedback message comprises all on-demand system information types in the on-demand system information request.
Preferably, the on-demand system information request response receiving apparatus 40 may include a second transmission determining module 405, and the second transmission determining module 405 is adapted to determine that the message 3 fails to be transmitted when the on-demand system information type in the feedback message includes a part of the on-demand system information type in the on-demand system information request or does not include the on-demand system information type in the on-demand system information request, and retransmit the on-demand system information type in the on-demand system information request or the on-demand system information type not included in the feedback message.
Preferably, the feedback message receiving module 403 may include a first receiving unit 4031 and a second receiving unit 4032.
The first receiving unit 4031 is adapted to receive the feedback message when the base station uses downlink control information with a format different from that of the downlink control information used for contention resolution to carry the feedback message; the second receiving unit 4032 is adapted to, when the downlink control information includes identification information, acquire a feedback message carried by the downlink control information, where the identification information is used to indicate that the downlink control information is requested by the base station for the received on-demand system information.
Further, when the value of the newly added bit is a first preset value, the second receiving unit 4032 receives the feedback message, which is carried by the downlink control information and is addressed to the on-demand system information request; and when the value of the newly added bit is configured to be a second preset value, the downlink control information carries resource indication information of a contention resolution MAC control unit.
For more details of the operation principle and the operation mode of the on-demand system information request response receiving apparatus 40, reference may be made to the relevant descriptions in fig. 1 to fig. 2, and details are not repeated here.
The embodiment of the invention also discloses a storage medium, on which computer instructions are stored, and when the computer instructions are operated, the steps of the on-demand system information request response method shown in fig. 1 or the steps of the on-demand system information request response receiving method shown in fig. 2 can be executed. The storage medium may include ROM, RAM, magnetic or optical disks, etc.
The embodiment of the invention also discloses a base station, which comprises a memory and a processor, wherein the memory is stored with computer instructions capable of running on the processor, and the processor executes the steps of the on-demand system information request response method shown in the figure 1 when running the computer instructions.
The embodiment of the invention also discloses user equipment which can comprise a memory and a processor, wherein the memory is stored with computer instructions capable of running on the processor. The processor, when executing the computer instructions, may perform the steps of the on-demand system information request response receiving method shown in fig. 2. The user equipment includes but is not limited to a mobile phone, a computer, a tablet computer and other terminal equipment.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (23)
1. An on-demand system information request response method, comprising:
receiving an on-demand system information request sent by at least one user equipment by using a message 3, wherein the on-demand system information request comprises an on-demand system information type, and an uplink resource of the message 3 is indicated in a random access response message acquired by the at least one user equipment by using a lead code and a physical random access channel resource;
configuring downlink control information so that the downlink control information carries a feedback message and indicates that the downlink control information is requested for the on-demand system information, wherein the feedback message comprises a received on-demand system information type;
and sending the downlink control information through a downlink physical control channel.
2. The on-demand system information request responding method according to claim 1, wherein the configuring the downlink control information so that the downlink control information carries a feedback message and indicates that the downlink control information is for the on-demand system information request comprises:
using downlink control information with a format different from that of the downlink control information used for contention resolution to carry the feedback message; alternatively, the first and second electrodes may be,
configuring identification information and the feedback message in downlink control information for contention resolution, wherein the identification information is used for indicating that the downlink control information is requested by the on-demand system information.
3. The on-demand system information request response method according to claim 2, wherein the identification information is a newly added bit in the downlink control information.
4. The on-demand system information request response method according to claim 3, wherein the configuring the identification information and the feedback message in the downlink control information for contention resolution comprises:
configuring the value of the newly added bit as a first preset value, and configuring the downlink control information to carry the feedback message aiming at the on-demand system information request; and when the value of the newly added bit is configured to be a second preset value, the downlink control information carries resource indication information of a contention resolution MAC control unit.
5. The on-demand system information request response method of claim 1, wherein the feedback message further comprises at least one historically received on-demand system information type.
6. An on-demand system information request response receiving method, comprising:
sending an on-demand system information request to a base station by using a message 3, wherein the on-demand system information request comprises an on-demand system information type, and an uplink resource of the message 3 is indicated in a random access response message acquired by using a lead code and a physical random access channel resource;
blind-detecting a downlink physical control channel sent by the base station to obtain downlink control information;
if the downlink control information indicates that a feedback message is requested for the on-demand system information, receiving a feedback message carried by the downlink control information, wherein the feedback message comprises the type of the on-demand system information received by the base station;
and if the on-demand system information types in the feedback message comprise all on-demand system information types in the on-demand system information request, determining that the message 3 is transmitted successfully.
7. The on-demand system information request response receiving method as claimed in claim 6, further comprising:
if the on-demand system information type in the feedback message includes part of the on-demand system information type in the on-demand system information request or does not include the on-demand system information type in the on-demand system information request, determining that the message 3 fails to transmit, and retransmitting the on-demand system information type in the on-demand system information request or the on-demand system information type not included in the feedback message.
8. The on-demand system information request response receiving method of claim 6, wherein the receiving the downlink control information bearer feedback message if the downlink control information indicates that the feedback message is for the on-demand system information request comprises:
receiving the feedback message if the base station uses downlink control information with a format different from that of the downlink control information used for contention resolution to carry the feedback message;
or, obtaining a feedback message carried by the downlink control information according to identification information in the downlink control information, where the identification information is used to indicate that the downlink control information is requested by the base station for the received on-demand system information.
9. The on-demand system information request response receiving method as claimed in claim 8, wherein the identification information is a newly added bit in the downlink control information.
10. The on-demand system information request response receiving method according to claim 9, wherein the obtaining the feedback message carried by the downlink control information according to the identification information in the downlink control information includes:
if the value of the newly added bit is a first preset value, receiving the feedback message which is carried by the downlink control information and aims at the system information request on demand; and when the value of the newly added bit is configured to be a second preset value, the downlink control information carries resource indication information of a contention resolution MAC control unit.
11. An on-demand system information request responding apparatus, comprising:
an on-demand system information request receiving module adapted to receive an on-demand system information request sent by at least one user equipment using a message 3, the on-demand system information request including an on-demand system information type, an uplink resource of the message 3 being indicated in a random access response message acquired by the at least one user equipment using a preamble and a physical random access channel resource;
a downlink control information configuration module, adapted to configure downlink control information so that the downlink control information carries a feedback message and indicates that the downlink control information is requested for the on-demand system information, the feedback message including a type of the received on-demand system information;
and the downlink control information sending module is suitable for sending the downlink control information out through a downlink physical control channel.
12. The on-demand system information request responding apparatus according to claim 11, wherein the downlink control information configuring module comprises:
a first configuration unit, adapted to use downlink control information with a format different from that of downlink control information used for contention resolution to carry the feedback message;
a second configuration unit, adapted to configure identification information and the feedback message in downlink control information used for contention resolution, where the identification information is used to indicate that the downlink control information is requested for the on-demand system information.
13. The on-demand system information request responding apparatus according to claim 12, wherein the identification information is a newly added bit in the downlink control information.
14. The on-demand system information request responding apparatus according to claim 13, wherein the second configuring unit configures the value of the newly added bit to be a first preset value, and configures the downlink control information to carry the feedback message for the on-demand system information request; and when the value of the newly added bit is configured to be a second preset value, the downlink control information carries contention resolution MAC control unit resource indication information.
15. The on-demand system information request responding device according to claim 11, wherein the feedback message further includes at least one historically received on-demand system information type.
16. An on-demand system information request response receiving apparatus, comprising:
an on-demand system information request sending module adapted to send an on-demand system information request to a base station using a message 3, the on-demand system information request including an on-demand system information type, an uplink resource of the message 3 being indicated in a random access response message acquired using a preamble and a physical random access channel resource;
a downlink control information acquisition module, adapted to blindly detect a downlink physical control channel sent by the base station to obtain the downlink control information;
a feedback message receiving module, adapted to receive a downlink control information bearer feedback message when the downlink control information indicates that a feedback message is for the on-demand system information request, where the feedback message includes an on-demand system information type received by the base station;
a first transmission determining module adapted to determine that the message 3 is successfully transmitted when the on-demand system information type in the feedback message includes all on-demand system information types in the on-demand system information request.
17. The on-demand system information request response receiving device according to claim 16, further comprising:
a second transmission determining module, adapted to determine that transmission of the message 3 fails when the on-demand system information type in the feedback message includes a part of the on-demand system information type in the on-demand system information request or does not include the on-demand system information type in the on-demand system information request, and retransmit the on-demand system information type in the on-demand system information request or the on-demand system information type not included in the feedback message.
18. The on-demand system information request response receiving device according to claim 16, wherein the feedback message receiving module includes:
a first receiving unit, adapted to receive the feedback message when the base station uses downlink control information with a format different from that of downlink control information used for contention resolution to carry the feedback message;
a second receiving unit, adapted to obtain a feedback message carried by downlink control information when the downlink control information used for contention resolution includes identification information, where the identification information is used to indicate that the downlink control information is requested by the base station for the received on-demand system information.
19. The on-demand system information request response receiving device as claimed in claim 18, wherein the identification information is a newly added bit in the downlink control information.
20. The on-demand system information request response receiving apparatus according to claim 19, wherein the second receiving unit receives the feedback message for the on-demand system information request, which is carried by the downlink control information, when the value of the newly added bit is a first preset value; and when the value of the newly added bit is configured to be a second preset value, the downlink control information carries contention resolution MAC control unit resource indication information.
21. A computer readable storage medium having stored thereon computer instructions, wherein the computer instructions when executed perform the steps of the on-demand system information request response method according to any one of claims 1 to 5 or the steps of the on-demand system information request response receiving method according to any one of claims 6 to 10.
22. A base station comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor, when executing the computer instructions, performs the steps of the on-demand system information request response method of any one of claims 1 to 5.
23. A user equipment comprising a memory and a processor, said memory having stored thereon computer instructions executable on said processor, wherein said processor when executing said computer instructions performs the steps of the on-demand system information request response receiving method of any one of claims 6 to 10.
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| CN110602799B (en) * | 2019-09-30 | 2021-10-29 | 北京紫光展锐通信技术有限公司 | Information processing method, network element equipment, terminal and storage medium |
| CN111065149B (en) * | 2019-12-10 | 2022-03-25 | 惠州Tcl移动通信有限公司 | System message acquisition method, device, user equipment and storage medium |
| US11570809B2 (en) * | 2020-03-06 | 2023-01-31 | Qualcomm Incorporated | Compact downlink control information for a two-step random access channel procedure |
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