CN102036346A - Method and system for transmitting scheduling information - Google Patents
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- CN102036346A CN102036346A CN2009101745970A CN200910174597A CN102036346A CN 102036346 A CN102036346 A CN 102036346A CN 2009101745970 A CN2009101745970 A CN 2009101745970A CN 200910174597 A CN200910174597 A CN 200910174597A CN 102036346 A CN102036346 A CN 102036346A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
本发明公开了一种调度信息传输的方法及系统，网络侧通过空口信令通知用户设备UE下一时间段的调度信息，UE收到该调度信息后，根据所接收的下一时间段的调度信息检测物理下行控制信道。所述空口信令是无线资源控制信令、媒质接入控制层信令、或物理下行链路控制信道信令。应用本发明的方法及系统，UE将可预先知道网络将在何时调度自己，UE就可以在合适的时间检测PDCCH，并且能够有选择的监听PDCCH，避免连续的检测PDCCH而造成的无效运算和能量损耗。
The invention discloses a scheduling information transmission method and system. The network side notifies the user equipment UE of the scheduling information of the next time period through the air interface signaling. The information detects the physical downlink control channel. The air interface signaling is radio resource control signaling, medium access control layer signaling, or physical downlink control channel signaling. Applying the method and system of the present invention, the UE can know in advance when the network will schedule itself, the UE can detect the PDCCH at an appropriate time, and can selectively monitor the PDCCH, avoiding invalid operations and failures caused by continuous PDCCH detection. energy loss.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a method and a system for scheduling information transmission.
Background
The evolved wireless communication system can provide a higher transmission rate, a shorter transmission delay, and can support mobility between The 3rd Generation Partnership Project (3 GPP) internal access systems and between a 3GPP access system and a non-3 GPP access system.
Fig. 1 is a schematic diagram of a next-generation Network Architecture of Long Term Evolution (Long Term Evolution, abbreviated as LTE) System/System Architecture Evolution (System Architecture Evolution, abbreviated as SAE)), which includes an Evolved Radio Access Network (E-RAN) and an Evolved Packet Core Network (E-PCN) as shown in fig. 1. Wherein, the E-RAN is composed of an evolved base station (eNodeB, abbreviated as eNB), and the E-PCN is composed of a Mobility Management Entity (MME) and a Serving Gateway Entity (Serving Gateway, abbreviated as S-GW). The interface between the eNB and the core network is an S1 interface, wherein the interface between the eNB and the MME is represented as S1-MME and is used for completing mobility management and control plane functions of an S1 interface; the interface between the eNB and the S-GW is denoted as S1-U, and is used to complete functions such as routing and transferring user data. The enbs are connected through an X2 interface, and an X2 interface is used for completing a mobility management function of User Equipment (User Equipment, UE) in an active state and information interaction between peer enbs.
When the ue is in a connected state in the LTE system, the Network allocates a Radio Network Temporary Identifier (RNTI), and the ue needs to detect all Physical downlink control channels (PDCCH for short) in a downlink subframe, and detect the PDCCH belonging to the ue and a Physical downlink shared channel (PDSCH for short) located in the same subframe according to the RNTI. In LTE, one radio frame (radio frame) is 10 ms as shown in fig. 2, and is composed of 10 subframes (sub-frames), each of which is 1 ms, and in one radio frame, a subframe is composed of subframes 0 to 9, each of which is composed of two slots (slots). Each radio Frame corresponds to a System Frame Number (SFN), which is cyclically used from 0 to 1023.
The conventional radio Resource control rrc (radio Resource control) signaling includes information for setting Discontinuous Reception (DRX), and the network sets DRX in consideration of traffic demands, power saving of the ue, and the like. When the user equipment in a connected state is not configured with DRX, the user equipment needs to continuously detect the PDCCH and detect the PDCCH belonging to the user equipment; when the user equipment in the connected state configures DRX, the user equipment only needs to continuously detect the PDCCH (in an awake state) during an Active-time (Active-time), and does not need to detect the PDCCH (in a sleep state) for the rest of time. Although the use of DRX can reduce the detection of PDCCH by the user equipment, the user equipment still needs to continuously detect PDCCH at Active-time.
In order to meet the demand of people for higher bandwidth, LTE Advance proposes to adopt a Carrier Aggregation (CA) method to achieve the purpose of larger bandwidth, and at this time, a cell is composed of multiple continuous or discontinuous carriers (each Carrier is called a Component Carrier), and can provide a multi-Carrier service for UE at the same time. The component carrier may adopt a carrier compatible with the LTE system, and such a carrier is referred to as a backward compatible carrier; the component carrier may also be a carrier that is incompatible with the existing LTE system, and this carrier is referred to as a non-backward compatible carrier, and this carrier can only be used by UEs of Release 10 and beyond.
For a connected UE, a plurality of operating Component carriers are called an active Carrier Set, a scheduling Carrier Set, or a serving Carrier Set, and may be divided into an uplink Carrier Set (UE UL Component Carrier Set) of the UE and a downlink Carrier Set (UE DL Component Carrier Set) of the UE according to uplink and downlink. In the downlink carrier set of the UE, the downlink carrier set may be further divided into a physical downlink control channel carrier set and a physical downlink shared channel carrier set, where the physical downlink control channel carrier set and the physical downlink shared channel carrier set may be the same set or different sets, and some carriers may only provide the PDSCH. And the UE in the connected state in the carrier aggregation cell needs to continuously detect the PDCCH of all the allocated downlink carriers and detect the PDCCH belonging to the UE according to the RNTI. Because the UE works on multiple carriers, the UE needs to consume more operations and more energy to continuously detect the allocated PDCCH, and how to enable the UE to effectively detect the PDCCH without packet loss, the existing protocol does not provide a reasonable solution.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method and a system for scheduling information transmission, which are used to indicate that a user equipment can more effectively detect a physical downlink control channel without packet loss, thereby avoiding energy consumption caused by blind detection.
In order to solve the above problem, the present invention provides a method for scheduling information transmission, including: and the network side informs the scheduling information of the user equipment in the next time period through an air interface signaling.
The method further comprises: and after receiving the scheduling information of the next time period, the user equipment detects the physical downlink control channel when the next time period arrives according to the received scheduling information of the next time period.
The air interface signaling is wireless resource control signaling, medium access control layer signaling or physical downlink control channel signaling.
The starting position of the next time period refers to the starting position of the next subframe of the subframe corresponding to the moment when the user equipment receives the radio resource control signaling, the media access control layer signaling or the physical downlink control channel signaling; or, the starting position of the next time period refers to a starting position of an nth subframe after a subframe corresponding to the time when the user equipment receives the radio resource control signaling, the medium access control layer signaling, or the physical downlink control channel signaling, where N is a positive integer greater than 1.
The initial position of the Nth subframe is notified to the user equipment by the network side equipment through an air interface signaling, or is configured in a default mode; the default mode configuration refers to that the interval between the nth subframe and the subframe corresponding to the user equipment when receiving the signaling carrying the scheduling information is determined by adopting a default configuration, or refers to that the starting position of the nth subframe is determined by adopting a mode specified by a protocol.
The next time period is a period of time having a finite length of time or an infinite length of time. The limited time length or the unlimited time length is notified to the user equipment by the network side equipment through an air interface signaling, or is configured in a default mode.
The scheduling information refers to information of time or a subframe where a physical downlink control channel of the user equipment exists; or information of time or subframe of physical downlink control channel not including the user equipment; or a combination of both.
In carrier aggregation, the network side device notifies the user equipment of scheduling information in the next time period of one or more carriers through an air interface signaling. In carrier aggregation, the network side device notifies the next time period scheduling information of one or more carriers through one carrier; or respectively notifying the user equipment of the scheduling information of the next time period of the carrier wave through each carrier wave. In the carrier aggregation, the network side further notifies the user equipment of the number of physical downlink control channels for scheduling the user equipment in each subframe, the number of carriers for scheduling the user equipment, or the carrier information for scheduling the user equipment.
The network side device notifies the user equipment of the next time period scheduling information of one or more carriers through one carrier, and the network side device needs to indicate carrier information corresponding to the scheduling information in an air interface signaling. The carrier information is represented by frequency, or by carrier index, or by physical layer identifier of the carrier, or by global identifier of the carrier.
Aiming at the carrier aggregation, the invention also provides a method for transmitting the scheduling information, which comprises the following steps: and the network side informs the user equipment of the scheduling information of the next time period of one or more carriers through air interface signaling.
The method further comprises: and after receiving the scheduling information, the user equipment detects the physical downlink control channel according to the received scheduling information of the next time period.
The air interface signaling is wireless resource control signaling, medium access control layer signaling or physical downlink control channel signaling.
The starting position of the next time period refers to the starting position of the subframe corresponding to the moment when the user equipment receives the radio resource control signaling, the medium access control layer signaling or the physical downlink control channel signaling; or, the starting position of the next time period refers to a starting position of an nth subframe after a subframe corresponding to the time when the user equipment receives the radio resource control signaling, the medium access control layer signaling, or the physical downlink control channel signaling, where N is a positive integer greater than or equal to 1.
The initial position of the nth subframe is notified to the user equipment by the network side equipment through an air interface signaling, or configured in a default mode; the default mode configuration refers to that the interval between the nth subframe and the subframe corresponding to the user equipment when receiving the signaling carrying the scheduling information is determined by adopting a default configuration, or refers to that the starting position of the nth subframe is determined by adopting a mode specified by a protocol.
The next time period is a period of time having a finite length of time or an infinite length of time. The limited time length or the unlimited time length is notified to the user equipment by the network side equipment through an air interface signaling, or is configured in a default mode.
The scheduling information refers to information of time or a subframe where a physical downlink control channel of the user equipment exists; or information of time or subframe of physical downlink control channel not including the user equipment; or the number of physical downlink control channels for scheduling the user equipment in each subframe or the number of carriers for scheduling the user equipment; or means that the carrier information of the user equipment is scheduled in each subframe; or a combination of the four.
In carrier aggregation, the network side device notifies the user equipment of next time period scheduling information of one or more carriers through one carrier; or respectively notifying the user equipment of the scheduling information of the next time period of the carrier wave through each carrier wave.
The network side device notifies the user equipment of the next time period scheduling information of one or more carriers through one carrier, and the network side device needs to indicate carrier information corresponding to the scheduling information in an air interface signaling. The carrier information is represented by frequency, or by carrier index, or by physical layer identifier of the carrier, or by global identifier of the carrier.
The invention also provides a system for scheduling information transmission, comprising: network side equipment and user equipment, wherein:
the network side device is configured to notify the user equipment of scheduling information of the next time period of one or more carriers through an air interface signaling;
and the user equipment is used for receiving the scheduling information of the next time period and detecting the physical downlink control channel according to the received scheduling information of the next time period.
The air interface signaling is wireless resource control signaling, media access control layer signaling or physical downlink control channel signaling; the starting position of the next time period refers to the starting position of the subframe corresponding to the moment when the user equipment receives the radio resource control signaling, the medium access control layer signaling or the physical downlink control channel signaling; or, when the ue receives the radio resource control signaling, the mac layer signaling, or the physical downlink control channel signaling, the ue corresponds to the starting position of the nth subframe after the subframe at the time, where N is a positive integer greater than or equal to 1.
The next time period is a period of time having a finite length of time or an infinite length of time. The limited time length or the unlimited time length is notified to the user equipment by the network side equipment through an air interface signaling, or is configured in a default mode.
The scheduling information refers to information of time or a subframe where a physical downlink control channel of the user equipment exists; or information of time or subframe of physical downlink control channel not including the user equipment; or the number of physical downlink control channels for scheduling the user equipment in each subframe or the number of carriers for scheduling the user equipment; or means that the carrier information of the user equipment is scheduled in each subframe; or a combination of the four.
In carrier aggregation, the network side device notifies the user equipment of next time period scheduling information of one or more carriers through one carrier; or respectively notifying the user equipment of the scheduling information of the next time period of the carrier wave through each carrier wave.
The network side device notifies the user equipment of scheduling information of a next time period of one or more carriers through one carrier, and the network side device needs to indicate carrier information corresponding to the scheduling information in an air interface signaling, where: the carrier information is represented by frequency, or by carrier index, or by physical layer identifier of the carrier, or by global identifier of the carrier.
By applying the method and the system for transmitting the scheduling information, the network side equipment informs the user equipment UE of the scheduling information of the next time period through an air interface signaling, after the UE receives the scheduling information, the UE can know in advance when the network schedules the UE, the UE can detect the PDCCH at a proper time and can selectively monitor the PDCCH, and invalid operation and energy loss caused by continuous detection of the PDCCH are avoided. Therefore, the user equipment UE can find the PDCCH belonging to the user equipment UE according to the scheduling information, and energy consumption caused by blind detection is avoided.
Drawings
Fig. 1 is a schematic diagram of a next generation network architecture for LTE system/system architecture evolution;
FIG. 2 is a schematic diagram of a radio frame configuration of an LTE system;
fig. 3 is a schematic diagram of a method and system for transmitting scheduling information according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
Aiming at the requirement that user equipment needs to continuously detect a Physical Downlink Control Channel (PDCCH) in the related art, the invention provides a technical scheme for optimized transmission of scheduling information, as shown in figure 3, and the core idea is as follows: and the network side equipment informs the user equipment of the scheduling information of the next time period through an air interface signaling. And after receiving the scheduling information, the user equipment detects the physical downlink control channel when the next time slot arrives according to the received scheduling information of the next time slot.
The network side informs the user equipment through air interface signaling such as radio resource control signaling, medium access control layer signaling, or physical downlink control channel signaling.
The starting position of the next time period is the starting position of the next subframe of the subframe corresponding to the air interface signaling received by the user equipment, or the starting position of a subframe after the user equipment receives the subframe corresponding to the air interface signaling, for example, the nth subframe, where N is a natural number greater than 1.
And the initial position of the Nth subframe is notified to the UE by a network side through air interface signaling or configured in a default mode. The default mode configuration refers to that an interval between the nth subframe and a subframe corresponding to the air interface signaling is determined by adopting a default configuration, or refers to that a starting position of the nth subframe is determined by adopting a mode specified by a protocol.
The next time period refers to a period of finite or infinite time.
The scheduling information refers to time or subframe information when the PDCCH of the user equipment exists, or time or subframe information when the PDCCH of the user equipment does not exist, or a combination of the two.
In carrier aggregation, a network side notifies the user equipment of scheduling information of a next time period of one or more carriers.
And after receiving the scheduling information, the user equipment monitors the PDCCH according to the scheduling information in the next time period.
As shown in fig. 3, the system for scheduling information transmission of the present invention includes: network side equipment and user equipment, wherein:
the network side device is configured to notify the user equipment of scheduling information of the next time period of one or more carriers through an air interface signaling;
and the user equipment is used for receiving the scheduling information of the next time period and detecting the physical downlink control channel according to the received scheduling information of the next time period.
The air interface signaling is wireless resource control signaling, media access control layer signaling or physical downlink control channel signaling; the starting position of the next time period refers to the starting position of the subframe corresponding to the moment when the user equipment receives the radio resource control signaling, the medium access control layer signaling or the physical downlink control channel signaling; or, when the ue receives the radio resource control signaling, the mac layer signaling, or the physical downlink control channel signaling, the ue corresponds to the starting position of the nth subframe after the subframe at the time, where N is a positive integer greater than or equal to 1. The next time period is a period of time having a finite length of time or an infinite length of time.
The scheduling information refers to information of time or a subframe where a physical downlink control channel of the user equipment exists; or information of time or subframe of physical downlink control channel not including the user equipment; or the number of physical downlink control channels for scheduling the user equipment in each subframe or the number of carriers for scheduling the user equipment; or means that the carrier information of the user equipment is scheduled in each subframe; or a combination of the four.
In carrier aggregation, the network side device notifies the user equipment of next time period scheduling information of one or more carriers through one carrier; or respectively notifying the user equipment of the scheduling information of the next time period of the carrier wave through each carrier wave.
The network side device notifies the user equipment of scheduling information of a next time period of one or more carriers through one carrier, and the network side device needs to indicate carrier information corresponding to the scheduling information in an air interface signaling, where: the carrier information is represented by frequency, or by carrier index, or by physical layer identifier of the carrier, or by global identifier of the carrier.
Referring to the system for scheduling information transmission as shown in fig. 3, a method for scheduling information transmission of the present invention includes: and the network side informs the scheduling information of the user equipment in the next time period through an air interface signaling. Further, after receiving the scheduling information of the next time period, the user equipment detects the physical downlink control channel when the next time period arrives according to the received scheduling information of the next time period.
Wherein the air interface signaling is radio resource control signaling, medium access control layer signaling or physical downlink control channel signaling.
The starting position of the next time period refers to the starting position of the next subframe of the subframe corresponding to the moment when the user equipment receives the radio resource control signaling, the media access control layer signaling or the physical downlink control channel signaling; or, the starting position of the next time period refers to a starting position of an nth subframe after a subframe corresponding to the time when the user equipment receives the radio resource control signaling, the medium access control layer signaling, or the physical downlink control channel signaling, where N is a positive integer greater than 1. The initial position of the Nth subframe is notified to the user equipment by the network side equipment through an air interface signaling, or is configured in a default mode; the default mode configuration refers to that the interval between the nth subframe and the subframe corresponding to the user equipment when receiving the signaling carrying the scheduling information is determined by adopting a default configuration, or refers to that the starting position of the nth subframe is determined by adopting a mode specified by a protocol.
The next time period is a period of time having a finite length of time or an infinite length of time. The limited time length or the unlimited time length is notified to the user equipment by the network side equipment through an air interface signaling, or is configured in a default mode.
The scheduling information refers to information of time or a subframe where a physical downlink control channel of the user equipment exists; or information of time or subframe of physical downlink control channel not including the user equipment; or a combination of both.
In carrier aggregation, the network side device notifies the user equipment of scheduling information in the next time period of one or more carriers through an air interface signaling. In carrier aggregation, the network side device notifies the next time period scheduling information of one or more carriers through one carrier; or respectively notifying the user equipment of the scheduling information of the next time period of the carrier wave through each carrier wave. In the carrier aggregation, the network side further notifies the user equipment of the number of physical downlink control channels for scheduling the user equipment in each subframe, the number of carriers for scheduling the user equipment, or the carrier information for scheduling the user equipment.
The network side device notifies the user equipment of the next time period scheduling information of one or more carriers through one carrier, and the network side device needs to indicate carrier information corresponding to the scheduling information in an air interface signaling. The carrier information is represented by frequency, or by carrier index, or by physical layer identifier of the carrier, or by global identifier of the carrier.
Referring to the system shown in fig. 3, for carrier aggregation, the present invention further provides a method for scheduling information transmission, including: and the network side informs the user equipment of the scheduling information of the next time period of one or more carriers through air interface signaling. Further, after receiving the scheduling information, the user equipment detects the physical downlink control channel according to the received scheduling information of the next time period.
The air interface signaling is wireless resource control signaling, medium access control layer signaling or physical downlink control channel signaling.
The starting position of the next time period refers to the starting position of the subframe corresponding to the moment when the user equipment receives the radio resource control signaling, the medium access control layer signaling or the physical downlink control channel signaling; or, the starting position of the next time period refers to a starting position of an nth subframe after a subframe corresponding to the time when the user equipment receives the radio resource control signaling, the medium access control layer signaling, or the physical downlink control channel signaling, where N is a positive integer greater than or equal to 1.
The initial position of the nth subframe is notified to the user equipment by the network side equipment through an air interface signaling, or configured in a default mode; the default mode configuration refers to that the interval between the nth subframe and the subframe corresponding to the user equipment when receiving the signaling carrying the scheduling information is determined by adopting a default configuration, or refers to that the starting position of the nth subframe is determined by adopting a mode specified by a protocol.
The next time period is a period of time having a finite length of time or an infinite length of time. The limited time length or the unlimited time length is notified to the user equipment by the network side equipment through an air interface signaling, or is configured in a default mode.
The scheduling information refers to information of time or a subframe where a physical downlink control channel of the user equipment exists; or information of time or subframe of physical downlink control channel not including the user equipment; or the number of physical downlink control channels for scheduling the user equipment in each subframe or the number of carriers for scheduling the user equipment; or means that the carrier information of the user equipment is scheduled in each subframe; or a combination of the four.
In carrier aggregation, the network side device notifies the user equipment of next time period scheduling information of one or more carriers through one carrier; or respectively notifying the user equipment of the scheduling information of the next time period of the carrier wave through each carrier wave.
The network side device notifies the user equipment of the next time period scheduling information of one or more carriers through one carrier, and the network side device needs to indicate carrier information corresponding to the scheduling information in an air interface signaling. The carrier information is represented by frequency, or by carrier index, or by physical layer identifier of the carrier, or by global identifier of the carrier.
Specific implementations of embodiments of the present invention will be described in detail below with reference to examples.
Example one:
in the LTE system, a UE is located in a serving cell and is in a connected state, and the UE has an uplink working carrier and a downlink working carrier respectively. The UE needs to continuously detect the PDCCH and detects the PDCCH belonging to the UE according to the RNTI of the UE. In order to realize the invention, the network side informs the UE of the scheduling information of the next time slot through an air interface signaling, after the UE receives the scheduling information, the UE knows in advance when the network schedules itself, and the UE can detect the PDCCH at a proper time, thereby avoiding invalid operation and energy loss caused by continuous detection of the PDCCH.
The network side notifies the scheduling information to the UE through Radio Resource Control (RRC) signaling, medium access Control layer signaling, or Physical Downlink Control Channel (PDCCH) and other air interface signaling, that is: and the network side informs the UE of the scheduling information of the next time period.
The next time period may be limited time information, such as 10 ms, or may be unlimited time information, that is, the network always schedules the UE in a certain specific manner (e.g., periodically); the next time period may be a time period immediately after the UE receives the air interface signaling, for example, immediately 10 ms, or a time period not immediately after the UE receives the signaling, where the start time of the time period may be indicated in the signaling or a default manner, for example, starting from the start position of the next radio frame (10 ms of one radio frame) or starting from the start position of the nth radio frame. The network side may also indicate the start and/or the exact time information of the termination of the next time period through air signaling, i.e. indicate the length of the next time period by indicating the termination time (or subframe).
The scheduling information may be time or subframe information for scheduling the UE by the network side (i.e., time or subframe information for the PDCCH of the UE), or may be time or subframe information for not scheduling the UE.
The MAC Control layer signaling is also called MAC Control Elements (MAC CE for short), and the existing MAC CE includes a Buffer Status Report (Buffer Status Report) and a Power Headroom (Power Headroom) reported by the UE, and further includes a CRNTI configured by the network, a TA Command (Timing Advance Command), and the like. If the network side notifies the scheduling information of the UE in the next time period through a Media Access Control (MAC) layer signaling, in order to realize that the network side notifies the scheduling information of the UE in the next time period, the MAC CE needs to be extended to include the scheduling information of the UE in the next time period.
The scheduling information may be time or subframe information for scheduling the UE within the next 10 ms (next time period) after the UE receives the medium access control layer signaling, for example, the UE may be scheduled in the next 1 ms, 5 ms, and 8 ms. After receiving the mac layer signaling, the UE only needs to detect the PDCCH in the immediately following 1 st ms, 5 th ms, and 8 th ms, and does not need to continuously detect in the whole next time period. During the rest of the next 10 ms (next time period), the UE may turn off the rf receiving unit to save energy, or may use the spare time to acquire the system message of the neighboring cell (if the system message of the neighboring cell needs to be acquired), or do other things.
It should be noted that the network side may transmit new scheduling information in the immediately following 5 th millisecond or 8 th millisecond, and the UE performs PDCCH detection according to the new scheduling information after receiving the new scheduling information.
Similarly, if the UE is notified of the scheduling information in the next time period by using an RRC signaling or an air interface signaling such as a PDCCH, the content of the existing protocol needs to be extended so that the existing protocol can include the scheduling information related to the UE.
By adopting the method of the invention, the UE can acquire the scheduling information of the next time period, and can selectively monitor the PDCCH in a proper subframe or moment, thereby avoiding unnecessary detection and saving energy.
Example two:
the application scenario of this example 2 is an LTE Advance system, and the UE is in an idle state in the carrier aggregation cell. In the frequency Band 1(Band 1), there are 3 contiguous component carriers CC (f1), CC (f2), and CC (f3) in the downlink and 3 contiguous carriers CC (f4), CC (f5), and CC (f6) in the uplink, and in this example 2, the component carriers are identified by frequency information of each component carrier, but the carrier identification method is not limited in the present invention. And the three downlink carriers all send system messages and paging messages.
At a certain time, the UE initiates random access to the uplink CC (f4) and the downlink CC (f1), and successfully accesses the cell with the carrier aggregation. Because the UE supports multiple carriers and the traffic flow is large, the base station allocates the component carriers UL CC (f5) and DL CC (f2) to the UE, that is, at this time, the UE uses two component carriers simultaneously, and both the uplink carrier set of the UE and the downlink carrier set of the UE include two carriers. Two carriers in a downlink carrier set of the UE both send PDCCHs, and the UE needs to receive the PDCCHs of the two carriers all the time and solve the PDCCH belonging to the UE according to the RNTI of the UE.
In order to realize the method, the network side informs the UE of the scheduling information of the next time period through an air interface signaling, and after the UE receives the scheduling information of the next time period, the UE can detect the PDCCH at a proper time by knowing when the network schedules the UE, so that invalid operation and energy loss caused by continuous detection of the PDCCH are avoided. Because the downlink carrier of the UE is concentrated with two carriers, the network side needs to indicate the scheduling information of the UE in the next time period of the two carriers respectively.
The network side notifies the UE of the scheduling information of the next time period through an air interface signaling such as a Radio Resource Control (RRC) signaling, a medium access Control layer signaling, or a Physical Downlink Control Channel (PDCCH), that is, the network side notifies the UE of the scheduling information of the next time period in the two carriers.
The next time period may be limited time information, such as 20 ms, or may be unlimited time information, that is, the network always schedules the UE in a certain specific manner (e.g., periodically); the next time period may be a time period immediately after the UE receives the air interface signaling, for example, immediately after 20 milliseconds; it may also be a period of time not immediately after the air interface signaling is received, and the starting time of the period of time may be indicated in the signaling or may be a default manner, such as starting from the starting position of the next radio frame (10 ms of one radio frame) or starting from the starting position of the nth radio frame.
The scheduling information may be time or subframe information for scheduling the UE by the network side (i.e., time or subframe information for the PDCCH of the UE), or time or subframe information for not scheduling the UE. The network side may notify the UE of the scheduling information of the next time period in the two carriers CC (f1) and CC (f2) through the downlink CC (f1), or may indicate the scheduling information of the next time period in the respective carriers UE on the downlink CC (f1) and downlink CC (f2), respectively. If a certain downlink Carrier indicates the scheduling information of the UE in the next time period of other carriers, the network side needs to indicate Carrier information in air interface signaling, and the Carrier information may be represented by frequency, or by Carrier Index (Carrier Index), or by physical layer identifier or global identifier of the Carrier.
At a certain time, the UE receives a signaling sent by the network side through RRC signaling or MAC signaling or PDCCH at the downlink CC (f1), where the signaling includes scheduling information of the UE in the next time period of the downlink CC (f1) and the downlink CC (f2), in this embodiment, a starting position of the next time period adopts a default setting, and the length of the next time period may be configured or set by the signaling after 10 milliseconds after the signaling is received, and in this embodiment, the length of the next time period adopts a default setting of 20 milliseconds. The scheduling information is that within 20 milliseconds after 10 milliseconds after the signaling is received, certain specific subframes schedule the UE.
After receiving the air interface signaling with the scheduling information, the UE needs to continuously detect the PDCCHs on the two carriers in the subsequent 10 milliseconds, and only needs to detect the PDCCHs on the respective carriers in the specific subframe within 20 milliseconds after the 10 milliseconds. In other times, the UE may turn off the rf receiving unit to save energy, and may also use the spare time to obtain the system message of the neighboring cell (if the system message of the neighboring cell needs to be obtained), or do other things. The UE needs to continuously detect the PDCCH after the next time period.
It should be noted that, in this example, a continuous component carrier is taken as an example for description, and the processing for the discontinuous component carrier is substantially the same as the processing for the continuous component carrier, and is not described herein again.
Example three:
the application scenario of this example is an LTE Advance system, and the UE is in an idle state in the carrier aggregation cell. In the frequency Band 1(Band 1), there are 3 contiguous component carriers CC (f1), CC (f2), and CC (f3) in the downlink and 3 contiguous carriers CC (f4), CC (f5), and CC (f6) in the uplink, and in this example, the component carriers are identified by frequency information of each component carrier, but the carrier identification method is not limited in the present invention. And the three downlink carriers all send system messages and paging messages.
At a certain time, the UE initiates random access to the uplink CC (f4) and the downlink CC (f1), and successfully accesses the cell with the carrier aggregation. Since the UE supports multiple carriers and the traffic flow is large, the base station allocates component carriers UL CC (f5) and UL CC (f6), DL CC (f2) and DL CC (f3) to the UE, that is, at this time, the uplink carrier set of the UE and the downlink carrier set of the UE both include three carriers. In this embodiment, the network side indicates scheduling information of a next time period through a physical downlink control channel PDCCH, and the next time period may include a subframe in which PDCCH signaling is received.
At a certain moment, the network side indicates the scheduling information of the UE in the PDCCH of the DL CC (f1) in the next time period, assuming that the UE receives the scheduling information of the UE in the next 10 subframes (i.e., 10 milliseconds) when the PDCCH is in SFN 3 and the subframe is 4, the network side also indicates the UE to schedule the number of UEs in the SFN 3 and the subframe is 4, that is, at this moment, the network side sends the PDCCH of the UE on several downlink carriers or schedules the number of PDCCHs of the UE, and the network side may also indicate explicit carrier information (represented by frequency, or carrier index, or physical layer identifier or global identifier of the carrier) for scheduling the UE, so that the UE may only need to detect a specific carrier, and as an alternative scheme, the network side may indicate that the carrier information of the UE is not scheduled); the network side further indicates the number of UEs scheduled by the UE in each of the next 10 subframes (which may be the number of physical downlink control channels scheduling the UE in each subframe, or the number of carriers scheduling the UE), and the network may further indicate carrier information (represented by frequency, or carrier index, or represented by physical layer identifier or global identifier of a carrier) scheduling the UE in each subframe.
The network side indicates the UE to schedule the number of the UE (or the number of PDCCHs of the UE) in each subframe, so that the detection of the UE on multiple carriers can be reduced, for example, the UE sequentially detects the PDCCHs in each subframe according to the DL CC (f1), the CC (f2) and the CC (f3), if the UE knows that the network side schedules the number of the UE in the subframe, the UE can stop the detection after detecting the PDCCHs meeting the number, particularly, if the UE detects the PDCCH of the DL CC (f1), detects the PDCCH of the UE according to the RNTI and knows that the scheduling number of the current subframe is 1, the UE does not need to detect the PDCCHs of the DL CC (f2) and the DLCC (f3) any more. Similarly, if the network side instructs the UE to schedule the carrier information of the UE in each subframe, the UE can detect a specific carrier according to the explicit carrier information, avoiding redundant detection.
It should be noted that the network side may only indicate the number of UEs scheduled by the current subframe that receives the PDCCH (the number of carriers that schedule the UEs, or the number of PDCCHs that schedule the UEs), or the carrier information that schedules the UEs, may also indicate the number of UEs scheduled by each subframe that includes the current subframe that receives the PDCCH and a period of time later, or the carrier information that schedules the UEs, or may indicate the number of UEs scheduled by a period of time (immediately or non-immediately) after receiving the PDCCH, or the carrier information that schedules the UEs. The network side may indicate only information of an exact subframe where the UE is scheduled (or not scheduled) in the current carrier, or may indicate information of an exact subframe where the UE is scheduled (or not scheduled) in another carrier or carriers. The network side may also use the above methods in combination.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and they may alternatively be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, or fabricated separately as individual integrated circuit modules, or fabricated as a single integrated circuit module from multiple modules or steps. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
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| PCT/CN2010/077535 WO2011038696A1 (en) | 2009-09-30 | 2010-09-30 | Method and system for transmitting scheduling information |
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| CN102036346B (en) | 2015-06-03 |
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