WO2013097656A1 - Random access initiation notification method, random access resource notification method and master base station - Google Patents

Abstract

The embodiments of the present invention relate to a random access initiation notification method, a random access resource notification method, a data transmission resource notification method and a master base station. The random access initiation notification method includes: a master base station receiving a first notification message from a source device, the first notification message indicating the data to be transmitted by the source device to a destination device; the master base station sending a second notification message to the destination device, the second notification message indicating to the destination device to initiate random access toward the source device. The embodiments of the present invention avoid the user equipment monitoring the physical downlink control channel instruction on each base station.

Description

 Random access initiation, notification method for random access resources, and primary base station

 This application claims the priority of the Chinese application filed on December 27, 2011, the application number is 201110443786.0, and the invention name is "random access initiation, random access resource notification method and primary base station", the entire contents of which are incorporated by reference. Combined in this application. Technical field

 The present invention relates to the field of mobile communications, and in particular, to a notification method for random access initiation, a notification method for random access resources, a notification method for data transmission resources, and a primary base station. Background technique

 With the development of mobile communication systems, Carrier Aggregation (MAC) technology has been introduced in mobile communication systems, for example, Long Term Evolution (LTE) systems. Carrier aggregation means that User Equipment (UE) can use multiple Component Carriers (CCs) for uplink and downlink communication to support higher-speed data transmission. According to the base station to which the aggregated carrier belongs, the carrier aggregation can be divided into intra-base station cell aggregation, inter-base station cell aggregation, and the like. For example, in an LTE system, carrier aggregation (e.g., cell aggregation between base stations) across an evolved Node B (eNB) means that component carriers used by the UE are controlled by different base stations.

 In the carrier aggregation mode of the eNB, if a certain eNB has downlink data to be sent to a UE in an uplink out-of-synchronization state, a physical downlink control channel (hysical downlink) is sent to the UE through a cell (cell) under the eNB. The control channel (referred to as PDCCH) command (PDCCH order) notifies the UE to trigger a non-contention random access (RA) to re-enter the uplink synchronization state, and then sends downlink data to the UE.

The component carriers used by the UE in the carrier aggregation of the eNB are controlled by different base stations, and for the cells of each base station participating in the carrier aggregation, one cell is configured to transmit the PDCCH order. Therefore, when the UE is in an uplink out-of-synchronization state on all cells configured by the eNB to the UE, the UE needs to monitor the PDCCH order on the cell configured by the eNB. Therefore, in the carrier aggregation mode of the inter-eNB, when there is downlink data to be transmitted and the UE is in an uplink out-of-synchronization state, the UE needs to simultaneously monitor the PDCCH order on one of the configured cells on each eNB, so it is necessary to monitor a large number of cells. This causes unnecessary power consumption.

 In the carrier aggregation mode of the eNB, if the UE is in the uplink out-of-synchronization state on all the Ce1s of an eNB, the uplink data needs to be sent to the eNB, and the UE first queries the logical channel where the uplink data is located. Under the corresponding eNB, all the Ce lls configured for itself; one cell selected in these Ce lls, the contention RA is initiated to re-enter the uplink synchronization state; and the uplink data is sent to the eNB again. If the UE is in the uplink synchronization state, but there is no SR resource or the SR transmission reaches the maximum number, the uplink data needs to be sent, and the UE initiates the contention RA to obtain the uplink resource through a specific Cell, and sends the uplink data to the eNB. .

 However, in the above scheme, due to the RA of the competition, the preamble sequence (message) in the message 1 (msgl) is selected by the UE itself, and there may be other UEs transmitting the same preamble sequence code at the same time, thereby Cause conflicts. Therefore, the above scheme will lead to too many RAs in the competition, resulting in an increased probability of RA collisions and unnecessary consumption of system resources. Summary of the invention

 The embodiment of the present invention relates to a method for informing a random access, a method for notifying a random access resource, a method for notifying a data transmission resource, and a primary base station, so that the user equipment is lost in all cells of the secondary base station in the cross-base station carrier aggregation mode. The user equipment only needs to listen to the physical downlink control channel command PDCCH order of the primary base station, or the user equipment is in an out-of-synchronization state on all cells of the secondary base station, or is in a synchronized state but has no scheduling request. When the number of times the resource or scheduling request reaches the maximum number, and there is uplink data to be sent, it does not cause random access.

An aspect of the present invention provides a method for informing a random access, the method comprising: receiving, by a primary base station, a first notification message from a source device, where the first notification message indicates that the source device is to be transmitted to a destination device The data; The primary base station sends a second notification message to the destination device, where the second notification message indicates that the destination device initiates random access to the source device.

 An aspect of the present invention provides a method for notifying a random access resource, the method comprising: receiving, by a primary base station, a first notification message from a source device, where the first notification message indicates that the source device is to be transmitted to a destination device The data;

 The primary base station sends a second notification message to the destination device, where the second notification message indicates that the destination device sends a resource for random access to the source device.

 An aspect of the present invention provides a method for notifying a data transmission resource, the method comprising: receiving, by a primary base station, a first notification message from a source device, where the first notification message indicates that the source device is to be transmitted to a destination device Data

 The primary base station sends a second notification message to the destination device, where the second notification message indicates that the destination device allocates resources for transmitting the data to the source device.

 An aspect of the present invention provides a primary base station, where the primary base station includes:

 a receiving unit, configured to receive a first notification message from the source device, where the first notification message indicates that the source device has data to be transmitted to the destination device;

 And a notification unit, configured to send a second notification message to the destination device, where the second notification message instructs the destination device to initiate random access to the source device.

 An aspect of the present invention provides a primary base station, where the primary base station includes:

 a receiving unit, configured to receive a first notification message from the source device, where the first notification message indicates that the source device has data to be transmitted to the destination device;

 And a notification unit, configured to send a second notification message to the destination device, where the second notification message instructs the destination device to send a resource for random access to the source device.

 An aspect of the present invention provides a primary base station, where the primary base station includes:

 a receiving unit, configured to receive a first notification message from the source device, where the first notification message indicates that the source device has data to be transmitted to the destination device;

a notification unit, configured to send a second notification message to the destination device, where the second notification is The information indicates that the destination device allocates resources for transmitting the data to the source device.

 The method and the primary base station in the embodiment of the present invention prevent the user equipment from listening to the physical downlink control channel command on each base station in the cross-base station carrier aggregation mode, or preventing the user equipment from initiating a random access. DRAWINGS

 In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description are only some of the present invention. For the embodiments, those skilled in the art can obtain other drawings according to the drawings without any creative work.

 1 is a flowchart of a method for notifying a random access initiation according to an embodiment of the present invention; FIG. 2 is a flowchart of a method for notifying a random access resource according to an embodiment of the present invention; FIG. 4 is a flowchart of a method for notifying a data transmission resource according to an embodiment of the present invention; FIG. 5 is a schematic structural diagram of a primary base station according to an embodiment of the present invention;

 6 is a schematic structural diagram of a primary base station according to an embodiment of the present invention;

 FIG. 7 is a schematic structural diagram of a primary base station according to an embodiment of the present invention. detailed description

The technical solution of the present invention will be further described in detail below through the accompanying drawings and embodiments. In the embodiment of the present invention, the primary base station indicates to the user equipment or the secondary base station to initiate random access by using the second notification message, or sends a resource for performing random access, or allocates resources for transmitting data to implement transmission of downlink data or uplink data, thereby avoiding The user equipment monitors the physical downlink control channel command PDCCH order on each base station eNB participating in the aggregated carrier, or prevents the user equipment from initiating a random access of the competition. In each subframe of the LTE system, it is necessary to ensure that data transmitted by all UEs of the same cell arrive at the eNB at the same time, otherwise interference will be caused. Since the distances of the UEs and the eNBs are different, the uplink delays transmitted by the UEs are different. Therefore, each UE must maintain an Uplinking Timing (TA) with the eNB. If TA is valid, the UE can transmit uplink data. If the TA is invalid, the UE cannot transmit uplink data. Whether the TA is valid or not is controlled by a timer (Timeal Aignity t imer, TAT for short). Each time the eNB sends a TA time adjustment, the TAT is started. The UE receives the TA time adjustment command and also starts the TAT. In this way, the UE and the eNB can determine whether the TA is valid by whether the TAT times out. If the TA is still valid, the UE is in an uplink synchronization state under the cell of the eNB; if the TA is invalid, the UE is in an uplink out-of-synchronization state in the cell of the eNB.

 FIG. 1 is a flowchart of a method for notifying a random access initiation according to an embodiment of the present invention. The notification method in the embodiment of the present invention is that, in the carrier aggregation mode of the cross-base station, the UE is in an uplink out-of-synchronization state in all the Ce lls configured in a certain secondary base station to a certain UE, and the secondary base station has downlink data to be sent. Described for the case of the UE.

 In this example, the source device is a secondary base station, the destination device is a user equipment, and the data is downlink data. Since the secondary base station needs to send downlink data to the user equipment, since the user equipment is in the uplink out-of-synchronization state, it is required to initiate random access to enter the synchronization state.

 As shown in FIG. 1, the embodiment may include the following steps:

 Step 110: The primary base station receives a first notification message sent by the source device, where the first notification message indicates that the source device has data to be transmitted to the destination device.

 It should be understood that the first notification message may be sent by the secondary base station to the primary base station by using an X2 interface, where the first notification message includes an identification number of the user equipment and a physical random access channel (Physica l Random Acces s Channe l , PRACH) Resource indication.

Further, the primary base station further receives an identification number of the secondary base station when receiving the first notification message. The identifier of the secondary base station may be encapsulated with the first notification message and sent to the primary base station by using a tunnel layer of an interface between the primary base station and the secondary base station. of. Alternatively, the identifier of the secondary base station may be explicitly included in the first notification message; or may be indicated to the primary base station by some implicit manner. For example, the identifier of the secondary base station is implicitly indicated by the port number of the first notification message, and the primary base station may map the corresponding secondary base station according to the port number of the first notification message after receiving the first notification message. Identification Number.

 Step 120: The primary base station sends a second notification message to the destination device, where the second notification message indicates that the destination device initiates random access to the source device.

 For example, the step 120 may include: the primary base station sends, by using the primary cell, a second notification message carrying the identification number of the secondary base station and the PRACH resource indication to the user equipment corresponding to the identification number of the user equipment.

It should be understood that which cell is selected by the primary base station to transmit the second notification message is the basis for selecting the most reliable performance of the cell in the current primary base station. The most reliable cell selected is the primary cell. Specifically, when the user equipment establishes a connection with the network for the first time, the cell that the user equipment establishes the first connection automatically becomes the primary cell, and then the network side can add some secondary cells to the user equipment according to the requirement change. As the wireless environment changes, the original primary cell may become unreliable. At this time, the network side may change the primary cell to another relatively reliable secondary cell. At this time, the secondary cell serves as the primary cell. In the above description, it should be understood that the system pre-configures the address of the primary base station on the secondary base station, and configures the PDCCH order ₀ on the primary cell of the primary base station that the user equipment has monitored on the user equipment.

 In this embodiment, the second notification message is a physical downlink control channel command PDCCH order. After receiving the PDCCH order, the user equipment initiates random access to the secondary base station to obtain uplink synchronization, so that the user equipment has uplink resources. The acknowledgment information returned by the user equipment after receiving the downlink data is completed, thereby completing the data transmission. That is, as shown in FIG. 1, after step 120, step 1 30 may also be included.

 This embodiment may further include the following steps:

Step 1 30: The user equipment sends a secondary base to the PRACH resource corresponding to the PRACH resource indication. The secondary base station corresponding to the station identification number initiates random access and obtains uplink synchronization.

 The PRACH resource indication and the identifier of the secondary base station are used to indicate that the user equipment initiates a random to the secondary base station corresponding to the identifier of the secondary base station on the PRACH resource corresponding to the PRACH resource indication. Access.

 After the user equipment and the secondary base station complete the uplink synchronization, the SR resource is used to initiate the SR to obtain the uplink resource. After the secondary base station sends the downlink data to the user equipment, the user equipment sends an acknowledgement message to the secondary base station, thereby completing the downlink data. transmission.

 Therefore, in the carrier aggregation mode of the cross-base station, the user equipment monitors the second notification message PDCCH order sent by the primary cell of the primary base station, and the second notification message triggers the user equipment to be triggered by the second notification message. The PRACH resource initiates non-contention random access.

 In the embodiment of the present invention, when the user equipment is in the uplink out-of-synchronization state on all the cells of the secondary base station, the PDCCH order originally sent by each secondary base station is now concentrated by the primary base station, so that the user equipment only needs to monitor the primary base station. PDCCH order on the primary cell. Therefore, the user equipment in the embodiment of the present invention does not need to monitor the PDCCH order on each base station participating in carrier aggregation, but only needs to monitor the PDCCH order on the primary cell of the primary base station, thereby reducing unnecessary power consumption of the user.

 FIG. 2 is a flowchart of a method for notifying a random access resource according to an embodiment of the present invention. As shown in FIG. 2, the notification method in the embodiment of the present invention is directed to a carrier aggregation mode in a cross-base station, where uplink data needs to be sent on a logical channel corresponding to a certain base station in the UE, and the UE is in an uplink synchronization state, but there is no such base station. The corresponding SR resource or SR request reaches the maximum number of times; or the UE is described in the case that the UE is in the uplink out-of-synchronization state under all the Ce lls configured by the base station to the UE.

 The normal UE sends the uplink data to the eNB through the scheduling request (s cheduling reques t, SR for short), and after the eNB allocates the resources, the UE uses the allocated uplink resources to transmit the uplink data. The SR is sent using a dedicated PUCCH resource, that is, an SR resource.

In this example, the source device is a user equipment, the destination device is a secondary base station, and the data is uplink. Data.

 As shown in FIG. 2, this embodiment may include the following steps:

 Step 210: The primary base station receives a first notification message sent by the source device, where the first notification message indicates that the source device has data to be transmitted to the destination device.

 It should be understood that the first notification message may be sent by the user equipment to the primary base station, and the first notification message includes the identification number of the secondary base station. It should be understood that the identification number of the secondary base station may be explicitly included in the first notification message; the identification number of the secondary base station may also be implicitly included. For example, the first notification message may include a radio bearer identifier or a logical channel identifier of data to be transmitted to the secondary base station, and a radio bearer identifier or logic of data to be transmitted to the secondary base station. The channel may implicitly indicate the identification number of the secondary base station; after the primary base station receives the first notification message that includes the radio bearer identifier or the logical channel identifier of the data to be transmitted to the secondary base station, The radio bearer identifier or the logical channel identifier of the data transmitted to the secondary base station maps the identification number of the secondary base station.

 Further, the primary base station further receives an identification number of the user equipment when receiving the first notification message. The identifier of the user equipment may be encapsulated with the first notification message and sent to the primary base station through a tunnel layer of an interface between the primary base station and the user equipment. Or the identification number of the user equipment is determined by the primary base station according to a location where the first notification message is located. The primary base station may determine the identifier of the user equipment according to the received radio resource of the first notification message, because the radio resource of the first notification message sent by the user equipment is allocated by the primary base station. number.

 It should also be understood that the user equipment maintains uplink synchronization with the primary base station, and the user equipment has uplink resources, and the user equipment sends information to the primary base station through a cell in the synchronization state on the primary base station. The first notification message may be sent by physical layer signaling, such as an SR request, or may be sent by Media Access Concord (MAC) layer signaling, such as a MAC CE.

Step 220: The primary base station sends a second notification message to the destination device, where the second notification message indicates that the destination device sends the resource for random access to the source device. For example, the step 220 may include: the primary base station sends a second notification message carrying the identifier of the user equipment to the secondary base station corresponding to the identifier of the secondary base station by using the X2 interface.

 In this embodiment, after receiving the second notification message, the secondary base station sends a random access notification message to the user equipment according to the identifier of the user equipment carried in the second notification message, to send the random access to the user equipment. Resources. That is, as shown in FIG. 2, after step 220, steps 230 and 240 may also be included.

 This embodiment may further include the following steps:

 Step 230: The secondary base station sends, according to the second notification message, a random access notification message carrying the random access resource to the user equipment corresponding to the identifier of the user equipment, so that the user equipment is in the allocated random access resource. Up, initiate random access to the secondary base station.

 The random access resources include, for example, a random access code, a random access slot, and a PARCH resource. The random access notification message is PDCCH order. That is, the identifier of the user equipment is used to indicate that the secondary base station sends a random access notification message carrying a random access resource to the user equipment corresponding to the identifier of the user equipment, so that the The user equipment initiates random access to the secondary base station on the allocated random access resource.

 In this embodiment, the secondary base station allocates a random access resource, such as a random access code (ie, a preamb le ) and a random access slot, and a PARCH resource for carrying the UE according to the second notification message, so as to avoid existing As with the technology, the UE selects the random access code by itself, and other UEs may also transmit the same random access code, thereby causing collision and the base station cannot distinguish the identity of the UE.

 Step 240: The user equipment initiates random access in the PARCH resource according to the random access code and the random access time slot.

The user equipment is randomly accessed by the PDCCH order, and the user equipment sends a random access code in the PARCH resource in the random access slot. If the user equipment is in an out-of-synchronization state, and the user equipment initiates an RA to obtain synchronization again, the SR resource is used to initiate the SR to obtain the uplink resource, and the uplink data is sent; if the user equipment is in the The base station is configured to be in the uplink synchronization state for all the ce of the user equipment, but there is no SR resource or SR request. When the maximum number of times is reached, random access is initiated to directly obtain uplink resources, and uplink data is sent thereon.

 The embodiment of the present invention uses the second base station to transmit the uplink data to the secondary base station by using the second notification message carrying the identification number of the user equipment, and instructs the secondary base station to send the random access resource to the user equipment. The secondary base station triggers the user equipment to initiate non-contention random access, which avoids random access initiated by the user equipment as in the prior art.

 As shown in FIG. 3, a flowchart of a method for notifying a random access resource according to an embodiment of the present invention. In this embodiment, the embodiment shown in FIG. 3 is similar to the embodiment shown in FIG. 2. When the user equipment sends the first notification message, the first notification message may include a resource request in addition to the identification number of the secondary base station. the reason. The reason for the resource request is that there is uplink data on a logical channel corresponding to the secondary base station in the UE, and all the Cel1 configured by the UE to the UE in the secondary base station are in an uplink out-of-synchronization state. Therefore, as shown in FIG. 3, the notification method in the embodiment of the present invention is described in the case where the UE is in the uplink out-of-synchronization state in all the carriers configured by the UE to the UE in the carrier aggregation mode of the cross-base station.

 In this example, the source device is a user equipment, the destination device is a secondary base station, and the data is uplink data.

 The embodiment shown in Figure 3 has similar steps to the embodiment shown in Figure 2. As shown, the embodiment may include the following steps:

 Step 310: The primary base station receives a first notification message sent by the source device, where the first notification message indicates that the source device has data to be transmitted to the destination device.

It should be understood that the first notification message may be sent by the user equipment to the primary base station, and the first notification message may include an identifier number of the secondary base station and a resource request reason. It should be understood that the identifier of the secondary base station may be explicitly included in the first notification message; the identification number of the secondary base station may also be implicitly included. For example, the first notification message may include a radio bearer identifier or a logical channel identifier of data to be transmitted to the secondary base station, and the radio bearer identifier or logical channel of data to be transmitted to the secondary base station may be implicitly indicated. The identification number of the secondary base station; After receiving the first notification message of the radio bearer identifier or the logical channel identifier of the data to be transmitted to the secondary base station, the primary base station may perform radio bearer identification or logic according to data to be transmitted to the secondary base station. The channel identifier maps the identification number of the secondary base station.

 Further, the primary base station further receives an identification number of the user equipment when receiving the first notification message. The identifier of the user equipment may be encapsulated with the first notification message and sent to the primary base station through a tunnel layer of an interface between the primary base station and the user equipment. Or the identifier of the user equipment is determined by the primary base station according to the location where the first notification message is located; because the radio resource of the first notification message sent by the user equipment is used by the primary base station The primary base station may determine the identification number of the user equipment according to the received radio resource of the first notification message.

 It should also be understood that the user equipment maintains uplink synchronization with the primary base station and the user equipment has uplink resources.

 Step 320: The primary base station sends a second notification message to the destination device, where the second notification message indicates that the destination device sends the resource for random access to the source device.

 For example, the step 320 may include: the primary base station sending, to the secondary base station corresponding to the identification number of the secondary base station, a second notification message carrying the identification number of the user equipment and the resource request reason.

 In this embodiment, after receiving the second notification message, the secondary base station sends a random access notification message to the user equipment according to the identifier of the user equipment and the resource request reason carried in the second notification message, to send the message to the user equipment. Random access resources. That is, as shown in FIG. 3, after step 320, the embodiment may further include the following steps:

In step 330, the secondary base station is in the uplink out-of-synchronization state of all the cells of the secondary base station, but the user equipment corresponding to the identification number of the user equipment is in the uplink out-of-synchronization state when the uplink data is to be sent. And sending a random access notification message carrying the random access resource, so that the user equipment initiates random access to the secondary base station on the allocated random access resource. The allocated random access resources include, for example, a random access code preamb le , a random access slot, and a PARCH resource; the random access notification message is an instruction PDCCH order. Instant The identifier of the user equipment and the resource request cause are used to indicate that the secondary base station sends a random access notification message carrying the random access resource to the user equipment corresponding to the identifier of the user equipment, And causing the user equipment to initiate random access to the secondary base station on the allocated random access resource.

 In this embodiment, the secondary base station allocates a random access code and a random access slot to the UE according to the resource request reason, and uses the PARCH resource for carrying the UE, so as to avoid the random access code selected by the UE itself, and other UEs may also Send the same code and cause a conflict.

 Step 340: The user equipment initiates random access on the PARCH resource according to the random access code and the random access time slot.

 The user equipment is triggered by the random access notification message, that is, the PDCCH 0 r de r, and the UE sends a random access code on the PARCH resource in the random access slot to enter the uplink synchronization state, and the SR is used to initiate the SR to obtain the uplink resource and send the uplink. data.

 The embodiment of the present invention uses the primary base station to notify the secondary base station of the requirement that the user equipment needs to send the uplink data by using the second notification message carrying the identification number of the user equipment and the resource request reason, and instructing the secondary base station to send the random access to the user equipment. Resources. The secondary base station triggers the user equipment to initiate non-contention random access, which avoids random access initiated by the user equipment as in the prior art.

 The method for notifying the random access resource in the embodiment of FIG. 2 and FIG. 3, the user equipment has uplink data sent to the secondary base station, and the user equipment is in an out-of-synchronization state on all cells of the secondary base station, or is in a synchronized state. When the scheduling request resource is not available or the number of scheduling requests reaches the maximum number, the second notification message may be used to instruct the secondary base station to send the random access resource to the user equipment, thereby reducing the chance of the UE initiating random access, especially reducing the randomness of the competition. The opportunity of access reduces the load of random access in the system, thereby reducing the probability of collision of random access and improving system performance.

As shown in FIG. 4, it is a flowchart of a method for notifying a data transmission resource according to an embodiment of the present invention. This embodiment is similar to the embodiment of FIG. 3, and the first notification message may include a resource request reason in addition to the identifier of the secondary base station, and in this example, the resource request reason is corresponding to the secondary base station in the UE. The uplink data needs to be sent on the logical channel, and the UE is in the uplink synchronization state, but there is no SR resource corresponding to the base station or the SR request reaches the maximum number of times. Therefore, the notification method in the embodiment of the present invention is directed to a carrier aggregation mode in a cross-base station, where uplink data needs to be sent on a logical channel corresponding to a certain base station in the UE, and the UE is in an uplink synchronization state, but there is no SR resource corresponding to the base station. Or the case where the SR requests the maximum number of times to describe.

 As shown in the figure, this embodiment may include the following steps:

 Step 410: The primary base station receives a first notification message from the source device, where the first notification message indicates that the source device has data to be transmitted to the destination device.

 It should be understood that the first notification message may be sent by the user equipment to the primary base station, where the first notification message includes an identification number of the secondary base station and a resource request reason. It should be understood that the identifier of the secondary base station may be explicitly included in the first notification message; the identification number of the secondary base station may also be implicitly included. For example, the first notification message may include a radio bearer identifier or a logical channel identifier of data to be transmitted to the secondary base station, and the radio bearer identifier or logical channel of data to be transmitted to the secondary base station may be implicitly indicated. The identifier of the secondary base station; after the primary base station receives the first notification message that includes the radio bearer identifier or the logical channel identifier of the data to be transmitted to the secondary base station, The radio bearer identifier or the logical channel identifier of the data of the base station maps the identification number of the secondary base station.

 Further, the primary base station further receives an identifier of the user equipment when receiving the first notification message. The identifier of the user equipment is encapsulated with the first notification message and sent to the primary base station by using a tunnel layer of an interface between the primary base station and the user equipment. Or the identifier of the user equipment is determined by the primary base station according to the location where the first notification message is located; because the radio resource of the first notification message sent by the user equipment is used by the primary base station The primary base station may determine the identification number of the user equipment according to the received radio resource of the first notification message.

Step 420: The primary base station sends a second notification message to the destination device, where the second notification message instructs the destination device to allocate resources for transmitting the data to the source device. For example, the step 420 may include: the primary base station sending, to the secondary base station corresponding to the identifier of the secondary base station, a second notification message carrying the identifier of the user equipment and the reason for the resource request.

 In this embodiment, after receiving the second notification message, the secondary base station directly allocates resources for transmitting data to the user equipment according to the identification number of the user equipment and the resource request reason carried in the second notification message. That is, as shown in FIG. 4, after the step 420, the embodiment may further include the following steps: Step 430: The secondary base station directly allocates an uplink resource to the user equipment corresponding to the user equipment according to the resource request reason; that is, the identifier of the user equipment. The number and the resource request cause are used to instruct the secondary base station to allocate an uplink resource to the user equipment corresponding to the identifier of the user equipment, to transmit data between the user equipment and the secondary base station.

 Therefore, in this embodiment of the present invention, compared with the embodiment of FIG. 2, in the case of having a resource request reason, the secondary base station can more simply pair the carrier in the synchronization state but not the SR resource or the SR request to reach the maximum number of times. The user equipment in the aggregation mode performs uplink resource allocation, and the user equipment does not need to initiate the non-contention RA to send the SR to obtain the uplink resource.

 The embodiment of the present invention uses the primary base station to notify the secondary base station of the requirement that the user equipment needs to send the uplink data by using the second notification message carrying the identification number of the user equipment and the resource request reason, and instructs the secondary base station to directly allocate the resource for transmitting data to the user equipment. . The resources for transmitting data are directly allocated by the secondary base station, preventing random access initiated by the user equipment as in the prior art.

 FIG. 5 is a schematic structural diagram of a primary base station according to an embodiment of the present invention. As shown in FIG. 5, the primary base station of this embodiment includes:

 The receiving unit 51 is configured to receive a first notification message from the source device, where the first notification message indicates that the source device has data to be transmitted to the destination device.

 The notification unit 52 is configured to send a second notification message to the destination device, where the second notification message indicates that the destination device initiates random access to the source device.

 The receiving unit 51 can be a receiver, and the notification unit 52 can be a transmitter.

When the source device is a secondary base station, and the destination device is a user equipment, the first notification message includes an identifier of the user equipment and a physical random access channel (PRACH) resource indication. Further, the receiving unit 51 is further configured to receive an identification number of the secondary base station. The identifier of the secondary base station is encapsulated with the first notification message and sent to the primary base station by using a tunnel layer of an interface between the primary base station and the secondary base station. Alternatively, the identifier of the secondary base station may be explicitly included in the first notification message; or may be indicated to the primary base station by some implicit manner. For example, the identifier of the secondary base station is implicitly indicated by the port number of the first notification message, and the primary base station may map the corresponding secondary base station identifier according to the port number of the first notification message after receiving the first notification message. . .

 The notification unit 52 is further configured to send, by using the primary cell, the second notification message that carries the PRACH resource indication and the identifier number of the secondary base station to the user equipment corresponding to the identifier of the user equipment. It should be understood that which cell the primary base station selects to transmit the second notification message is the basis for which the performance of the cell in the current primary base station is the most reliable. The most reliable cell selected is the primary cell. Specifically, when the user equipment establishes a connection with the network for the first time, the cell that the user equipment establishes the first connection automatically becomes the primary cell, and then the network side can add some secondary cells to the user equipment according to the requirement change. As the wireless environment changes, the original primary cell may become unreliable. At this time, the network side can change the primary cell to another relatively reliable secondary area. At this time, the secondary cell acts as the primary cell. The PRACH resource indication and the identifier of the secondary base station are used to indicate that the user equipment initiates random access to the secondary base station corresponding to the identifier of the secondary base station on the PRACH resource corresponding to the PRACH resource indication. .

 In this embodiment, the second notification message is a physical downlink control channel command PDCCH orde r. After receiving the PDCCH order, the user equipment initiates random access to the secondary base station to obtain uplink synchronization, so that the user equipment has uplink resources. The acknowledgment information returned by the user equipment after receiving the downlink data is transmitted, thereby completing the transmission of the downlink data.

Therefore, in the embodiment of the present invention, the primary base station sends the PDCCH order to the user equipment by using the receiving unit and the notification unit, and the notification unit transmits the PDCCH order to the user equipment in the carrier aggregation mode of the cross-base station. The user equipment only needs to monitor the second notification message PDCCH order sent by the primary cell of the primary base station, and the second notification message triggers the user equipment to initiate non-contention random access in the PRACH resource.

 In the embodiment of the present invention, the user equipment does not need to monitor the PDCCH order on each base station participating in the carrier aggregation to implement the resources required for completing the data transmission, but only needs to monitor the PDCCH order on the primary cell of the primary base station to implement the establishment. Complete the resources required for data transfer, thereby reducing the unnecessary power of the user;

 FIG. 6 is a schematic structural diagram of a primary base station according to an embodiment of the present invention. As shown in FIG. 6, the primary base station of this embodiment includes:

 The receiving unit 61 is configured to receive a first notification message from the source device, where the first notification message indicates that the source device has data to be transmitted to the destination device.

 The notification unit 62 is configured to send a second notification message to the destination device, where the second notification message indicates that the destination device sends the resource for random access to the source device. .

 The receiving unit 61 can be a receiver, and the notification unit 62 can be a transmitter.

 When the source device is a user equipment, and the destination device is a secondary base station, the first notification message includes an identifier of the secondary base station.

 It should be understood that the identifier of the secondary base station may be explicitly included in the first notification message; the identification number of the secondary base station may also be implicitly included. For example, the first notification message may include a radio bearer identifier or a logical channel identifier of data to be transmitted to the secondary base station, and the radio bearer identifier or logical channel of data to be transmitted to the secondary base station may be implicitly indicated. The identifier of the secondary base station; after the primary base station receives the first notification message that includes the radio bearer identifier or the logical channel identifier of the data to be transmitted to the secondary base station, The radio bearer identifier or the logical channel identifier of the data of the base station maps the identification number of the secondary base station.

Further, the receiving unit 61 is further configured to receive an identification number of the user equipment. The identifier of the user equipment is encapsulated with the first notification message and sent to the primary base station by using a tunnel layer of an interface between the primary base station and the user equipment. Or, The identification number of the user equipment is determined by the primary base station according to the location of the first notification message. The primary base station may determine the identification number of the user equipment according to the received radio resource of the first notification message, because the radio resource of the first notification message sent by the user equipment is allocated by the primary base station.

 The notification unit 62 is further configured to send, to the secondary base station corresponding to the identifier of the secondary base station, the second notification message that carries the identifier of the user equipment. The identifier of the user equipment is used to indicate that the secondary base station sends a random access notification message carrying a random access resource to the user equipment corresponding to the identifier of the user equipment, so that the user equipment And performing random access to the secondary base station on the allocated random access resource.

 When the first notification message further includes a resource request cause, the resource request cause is that the UE is in an uplink out-of-synchronization state, and the notification unit 62 is further configured to The secondary base station corresponding to the identification number of the secondary base station sends the second notification message carrying the identification number of the user equipment and the resource request reason.

 In this case, the identifier of the user equipment and the resource request cause are used to indicate that the secondary base station sends a random carrying random access resource to the user equipment corresponding to the identifier of the user equipment. And accessing the notification message, so that the user equipment initiates random access to the secondary base station on the allocated random access resource.

In the carrier aggregation mode of the cross-base station, the primary base station in the present embodiment has uplink data to be sent on the logical channel corresponding to a certain base station in the UE, and the UE is in the uplink synchronization state, but the base station does not correspond to the base station. The SR request or the SR request reaches the maximum number of times; or the UE is in the uplink out-of-synchronization state when all the Ce lls configured by the base station to the UE are in the uplink; the notification unit of the primary base station sends the second notification message to the secondary base station, by the user The identification number of the device, or the identifier of the user equipment and the resource request reason, indicate that the secondary base station sends the resource for random access to the user equipment; and after the secondary base station receives the second notification message of the primary base station, according to the second notification message, The identifier of the carried user equipment sends a random access notification message PDCCH order to the user equipment, so that the user equipment initiates random access to complete uplink data transmission, and prevent The user equipment initiates a random access of the competition.

 FIG. 7 is a schematic structural diagram of a primary base station according to an embodiment of the present invention. As shown in FIG. 7, the primary base station of this embodiment includes:

 The receiving unit 71 is configured to receive a first notification message from the source device, where the first notification message indicates that the source device has data to be transmitted to the destination device.

 The notification unit 72 is configured to send a second notification message to the destination device, where the second notification message indicates that the destination device allocates resources for transmitting the data to the source device.

 The receiving unit 71 can be a receiver, and the notification unit 72 can be a transmitter.

 When the source device is a user equipment, and the destination device is a secondary base station, the first notification message includes an identifier number of the secondary base station and a resource request reason.

 It should be understood that the identifier of the secondary base station may be explicitly included in the first notification message; the identification number of the secondary base station may also be implicitly included. For example, the first notification message may include a radio bearer identifier or a logical channel identifier of data to be transmitted to the secondary base station, and the radio bearer identifier or logical channel of data to be transmitted to the secondary base station may be implicitly indicated. The identifier of the secondary base station; after the primary base station receives the first notification message that includes the radio bearer identifier or the logical channel identifier of the data to be transmitted to the secondary base station, The radio bearer identifier or the logical channel identifier of the data of the base station maps the identification number of the secondary base station.

 Further, the receiving unit 71 is further configured to receive an identification number of the user equipment. The identifier of the user equipment is encapsulated with the first notification message and sent to the primary base station by using a tunnel layer of an interface between the primary base station and the user equipment. Alternatively, the identification number of the user equipment is determined by the primary base station according to the location of the first notification message. The primary base station may determine the identifier of the user equipment according to the received radio resource of the first notification message, because the radio resource of the first notification message sent by the user equipment is allocated by the primary base station. number.

The notifying unit 72 is further configured to use the identifier number of the primary base station to the secondary base station The corresponding secondary base station sends the second notification message carrying the identification number of the user equipment and the resource request reason.

 When the resource request reason is that the user equipment is in a synchronized state on all cells of the secondary base station, but no scheduling resource or scheduling request reaches a maximum number of times,

 The identifier of the user equipment and the resource request cause are used to indicate that the secondary base station allocates an uplink resource to the user equipment corresponding to the identifier of the user equipment, to transmit data between the user equipment and the secondary base station.

 The primary base station in the embodiment of the present invention, through the receiving unit and the notifying unit, in the carrier aggregation mode of the cross-base station, the uplink data needs to be sent on the logical channel corresponding to a certain base station in the UE, and the UE is in the uplink synchronization state, but there is no such When the base station corresponds to the SR resource or the SR request reaches the maximum number of times, the primary base station sends the second notification message to the secondary base station, and the secondary base station allocates the resource for transmitting the data to the user equipment by using the identifier of the user equipment and the resource request reason. So that the uplink data transmission is completed.

 Therefore, in the embodiment of the present invention, compared with the embodiment of FIG. 5, in the case of having a resource request reason, the notification unit may more simply perform carrier aggregation of the cross-base station in the synchronization state but without the SR resource or the SR request reaching the maximum number of times. The user equipment in the mode notifies the secondary base station to perform uplink resource allocation, and the user equipment does not need to initiate the non-contention RA to send the SR to obtain the uplink resource.

 The primary base station of the foregoing embodiment of the present invention can prevent the user equipment from monitoring and preventing random access initiated by the receiving unit and the notification unit, thereby reducing the random access load in the system, thereby reducing the collision probability of random access and improving system performance. .

A person skilled in the art should further appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both, in order to clearly illustrate hardware and software. Interchangeability, the composition and steps of the various examples have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. Professionals can use different methods to implement the described functions for each specific application, but this Implementations should not be considered to be outside the scope of the invention.

 The steps of a method or algorithm described in connection with the embodiments disclosed herein can be implemented in hardware, a software module executed by a processor, or a combination of both. Software modules can be placed in random access memory (RAM), memory, read only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or technology Any other form of storage medium known.

 The above described embodiments of the present invention are further described in detail, and the embodiments of the present invention are intended to be illustrative only. The scope of the protection, any modifications, equivalents, improvements, etc., made within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

Rights request

 A method for informing a random access, wherein the method includes: a primary base station receiving a first notification message from a source device, where the first notification message indicates that the source device is to be transmitted to a destination device Data

 The primary base station sends a second notification message to the destination device, where the second notification message indicates that the destination device initiates random access to the source device.

 The random access initiation notification method according to claim 1, wherein when the source device is a secondary base station and the destination device is a user equipment,

 The first notification message includes an identification number of the user equipment and a physical random access channel PRACH resource indication.

 The method for informing a random access initiation according to claim 1 or 2, wherein the method further comprises:

 The primary base station receives an identification number of the secondary base station.

 The method for notifying the random access initiation according to claim 3, wherein the identification number of the secondary base station is a tunnel layer and an interface through an interface between the primary base station and the secondary base station The notification message is encapsulated and sent to the primary base station; or the identifier of the secondary base station is included in the first notification message; or the identifier of the secondary base station is used by the first notification message. The port number is indicated to the primary base station.

 The method for transmitting a random access initiation according to claim 3, wherein the sending, by the primary base station, the second notification message to the destination device includes:

 The primary base station sends, by the primary cell, the second notification message carrying the PRACH resource indication and the identification number of the secondary base station to the user equipment corresponding to the identifier of the user equipment.

The random access initiation notification method according to claim 5, wherein the PRACH resource indication and the identification number of the secondary base station are used to indicate that the user equipment is corresponding to the PRACH resource indication. On the PRACH resource, the identification number of the secondary base station is opposite. The secondary base station should initiate random access.

 A method for notifying a random access resource, the method comprising: the primary base station receiving a first notification message from a source device, where the first notification message indicates that the source device is to be transmitted to a destination device Data

 The primary base station sends a second notification message to the destination device, where the second notification message indicates that the destination device sends a resource for random access to the source device.

 The method for notifying a random access resource according to claim 7, wherein the source device is a user equipment, and when the destination device is a secondary base station, the first notification message includes the secondary base station. The identifier or the logical channel identifier of the data to be transmitted to the secondary base station is used to indicate the identifier of the secondary base station.

 The method for notifying a random access resource according to claim 8, wherein the method further comprises:

 The primary base station receives an identification number of the user equipment.

 The method for notifying a random access resource according to claim 9, wherein the identification number of the user equipment is a tunnel layer and an interface through an interface between the primary base station and the user equipment. A notification message is encapsulated and sent to the primary base station; or, the identifier of the user equipment is determined by the primary base station according to the location of the first notification message.

 The method for notifying a random access resource according to claim 9 or 10, wherein the sending, by the primary base station, the second notification message to the destination device comprises:

 The primary base station sends the second notification message carrying the identification number of the user equipment to the secondary base station corresponding to the identification number of the secondary base station.

 The method for notifying a random access resource according to claim 9 or 10, wherein the first notification message further includes a resource request reason.

The method for notifying a random access resource according to claim 12, wherein the sending, by the primary base station, the second notification message to the destination device includes: The primary base station sends the second notification message carrying the identification number of the user equipment and the resource request reason to the secondary base station corresponding to the identification number of the secondary base station.

 The method for notifying a random access resource according to claim 1 or 13, wherein:

 The identifier of the user equipment is used to indicate that the secondary base station sends a random access notification message carrying a random access resource to the user equipment corresponding to the identifier of the user equipment, so that the user equipment Initiating random access to the secondary base station on the allocated random access resource; or

 When the resource request reason is that the user equipment is in an out-of-synchronization state on all cells of the secondary base station,

 The identifier of the user equipment and the resource request cause are used to indicate that the secondary base station sends a random access notification message carrying the random access resource to the user equipment corresponding to the identifier of the user equipment. So that the user equipment initiates random access to the secondary base station on the allocated random access resource.

 A method for notifying a data transmission resource, the method comprising: receiving, by a primary base station, a first notification message from a source device, where the first notification message indicates that the source device has data to be transmitted to a destination device ;

 The primary base station sends a second notification message to the destination device, where the second notification message indicates that the destination device allocates resources for transmitting the data to the source device.

 The method for notifying a data transmission resource according to claim 15, wherein the source device is a user equipment, and when the destination device is a secondary base station,

 The first notification message includes an identifier number of the secondary base station and a resource request cause; or the first notification message includes a resource request cause and a radio bearer identifier or a logical channel identifier of data to be transmitted to the secondary base station. And an identifier number used to indicate the secondary base station.

The method for notifying a data transmission resource according to claim 16, wherein the method further comprises: The primary base station receives an identification number of the user equipment.

 The method for notifying a data transmission resource according to claim 17, wherein the identification number of the user equipment is a tunnel layer that passes through an interface between the primary base station and the user equipment, and the first The notification message is encapsulated and sent to the primary base station; or the identification number of the user equipment is determined by the primary base station according to the location of the first notification message.

 The method for notifying a data transmission resource according to claim 17 or 18, wherein the sending, by the primary base station, the second notification message to the destination device includes:

 The primary base station sends the second notification message carrying the identification number of the user equipment and the resource request reason to the secondary base station corresponding to the identification number of the secondary base station.

 The method for notifying a data transmission resource according to claim 19, wherein when the resource request reason is that the user equipment is in a synchronization state on all cells of the secondary base station, but no scheduling resource or scheduling When the request reaches the maximum number of times,

 The identifier of the user equipment and the resource request cause are used to indicate that the secondary base station allocates an uplink resource to the user equipment corresponding to the identifier of the user equipment, to transmit data between the user equipment and the secondary base station.

 A primary base station, comprising:

 a receiving unit, configured to receive a first notification message from the source device, where the first notification message indicates that the source device has data to be transmitted to the destination device;

 And a notification unit, configured to send a second notification message to the destination device, where the second notification message instructs the destination device to initiate random access to the source device.

 The primary base station according to claim 21, wherein, when the source device is a secondary base station, and the destination device is a user equipment, the first notification message includes an identifier number and a physical area of the user equipment. Random access channel PRACH resource indication.

 23. The primary base station according to claim 22, wherein:

The receiving unit is further configured to receive an identification number of the secondary base station.

The primary base station according to claim 23, wherein the identification number of the secondary base station is encapsulated by the tunnel layer of the interface between the primary base station and the secondary base station and the first notification message. The identification number of the secondary base station is included in the first notification message; or the identification number of the secondary base station is indicated by the port number of the first notification message. The main base station.

 The primary base station according to claim 22 or 23, wherein the notification unit is further configured to send, by using the primary cell, the PRACH resource to the user equipment corresponding to the identifier of the user equipment. And indicating the second notification message of the identification number of the secondary base station.

 The primary base station according to claim 25, wherein the PRACH resource indication and the identification number of the secondary base station are used to indicate that the user equipment is on the PRACH resource corresponding to the PRACH resource indication. The secondary base station corresponding to the identification number of the secondary base station initiates random access.

 27. A primary base station, wherein the primary base station comprises:

 a receiving unit, configured to receive a first notification message from the source device, where the first notification message indicates that the source device has data to be transmitted to the destination device;

 And a notification unit, configured to send a second notification message to the destination device, where the second notification message instructs the destination device to send a resource for random access to the source device.

 The primary base station according to claim 27, wherein, when the source device is a user equipment, and the destination device is a secondary base station, the first notification message includes an identifier of the secondary base station; or And the first notification message includes a radio bearer identifier or a logical channel identifier of the data to be transmitted to the secondary base station, where the identifier of the secondary base station is used.

 29. The primary base station according to claim 28, wherein:

 The receiving unit is further configured to receive an identification number of the user equipment.

The primary base station according to claim 29, wherein the identification number of the user equipment is a tunnel layer that passes through an interface between the primary base station and the user equipment, and the first communication The information message is encapsulated and sent to the primary base station; or the identification number of the user equipment is determined by the primary base station according to the location of the first notification message.

 The primary base station according to claim 29 or 30, wherein the notification unit is further configured to send, to the secondary base station corresponding to the identification number of the secondary base station, an identification number carrying the user equipment. The second notification message.

 The primary base station according to claim 29 or 30, wherein, when the first notification message further includes a resource request cause, the notification unit is further configured to correspond to an identification number of the secondary base station The secondary base station sends the second notification message carrying the identification number of the user equipment and the resource request reason.

 33. The primary base station according to claim 31 or 32, characterized in that

 The identifier of the user equipment is used to indicate that the secondary base station sends a random access notification message carrying a random access resource to the user equipment corresponding to the identifier of the user equipment, so that the user equipment And performing random access to the secondary base station on the allocated random access resource;

 Or

 When the resource request reason is that the user equipment is in an out-of-synchronization state on all cells of the secondary base station,

 The identifier of the user equipment and the resource request cause are used to indicate that the secondary base station sends a random access notification message carrying the random access resource to the user equipment corresponding to the identifier of the user equipment. So that the user equipment initiates random access to the secondary base station on the allocated random access resource.

 34. A primary base station, where the primary base station includes:

 a receiving unit, configured to receive a first notification message from the source device, where the first notification message indicates that the source device has data to be transmitted to the destination device;

And a notification unit, configured to send a second notification message to the destination device, where the second notification message instructs the destination device to allocate, by the source device, a resource that transmits the data.

The primary base station according to claim 34, wherein the source device is a user equipment, and when the destination device is a secondary base station,

 The first notification message includes an identifier number of the secondary base station and a resource request cause; or the first notification message includes a resource request cause and a radio bearer identifier or a logical channel identifier of data to be transmitted to the secondary base station. And an identifier number used to indicate the secondary base station.

 The primary base station according to claim 35, wherein the receiving unit is further configured to receive an identification number of the user equipment.

 The primary base station according to claim 36, wherein the identification number of the user equipment is encapsulated in the tunnel layer of the interface between the primary base station and the user equipment and the first notification message. And being sent to the primary base station together; or, the identifier of the user equipment is determined by the primary base station according to a location where the first notification message is located.

 The primary base station according to claim 36 or 37, wherein the notification unit is further configured to send, to the secondary base station corresponding to the identification number of the secondary base station, an identification number carrying the user equipment. And the second notification message of the resource request reason.

 The primary base station according to claim 38, wherein when the resource request reason is that the user equipment is in a synchronized state on all cells of the secondary base station, but no scheduling resource or scheduling request reaches a maximum number of times Time,

 The identifier of the user equipment and the resource request cause are used to indicate that the secondary base station allocates an uplink resource to the user equipment corresponding to the identifier of the user equipment, to transmit data between the user equipment and the secondary base station.