CN101572904A - Method, device and system for controlling interference of UE to adjacent subdistrict - Google Patents
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Abstract
The invention relate to the field of communication, and discloses a method for controlling the interference of UE to an adjacent subdistrict. In the method, a node B receives UE measuring result transmitted by UE through an MAC data packet or uplink scheduling information in a CELL_FACH state, and controls the interference of UE to the adjacent subdistrict according to the measuring result of the UE. The invention also discloses a device and a system for controlling the interference of the UE to the adjacent subdistrict. The method, the device and the system can accurately control the interference of the UE to the adjacent subdistrict according to the measuring result reported by the UE.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method, an apparatus, and a system for UE to interfere with a neighboring cell.
Background
With the development of wireless communication technology, 3GPP (3rd Generation Partnership project) introduced a new feature of enhanced random Access in Release 8 version of WCDMA (Wideband Code Division Multiple Access). For a UE (user equipment) under CELL _ FACH, in order to reduce uplink transmission delay and increase uplink transmission rate, an Enhanced-Dedicated Channel (E-DCH) is used instead of a RACH in an Enhanced random access process to implement uplink transmission. The general flow of the enhanced random access includes a random access Preamble (Preamble) and resource allocation phase, a collision resolution phase, an E-DCH data transmission phase, and a release phase.
1. Random access preamble and resource allocation stage:
when the UE performs the enhanced random access, the corresponding preamble signature is selected to initiate the random access process according to the required resource type. When a Node B (base station Node) detects an access preamble, a resource allocation indication is performed through an Acquisition Indicator Channel (AICH) and an extended Acquisition Indicator Channel (E-AICH). And after receiving the resource allocation instruction, the UE uses the E-DCH allocated by the network side to carry out uplink transmission.
2. Conflict resolution phase
After UE obtains the resource allocation indication, it uses the resource allocated by the network side to start the uplink transmission, sends the UE's ID to Node B, and starts a timer. Before the timer is overtime, if the UE obtains the response of the Node B through an E-AGCH (E-DCH Absolute Grant Channel, enhanced dedicated Channel Absolute Grant Channel), the UE may continue to use the uplink resource; if the response is not received, after the timer is overtime, the UE stops using the uplink resource, and the conflict resolution stage is ended.
3. E-DCH data transmission phase and release phase
And the UE which obtains the response in the conflict resolution stage uses the E-DCH allocated by the network side to carry out uplink transmission. After the transmission is finished, the Node B can control the UE to release the uplink resources through signaling, and can also implicitly release the resources through the modes of scheduling information and a timer.
Since the UE in CELL _ FACH has no macro diversity, the uplink transmission of the UE may cause large interference to the neighboring CELL. Therefore, in order to reduce the interference of the cell edge users to the adjacent cell, one solution in the prior art is: and when the UE carries out uplink transmission through the E-DCH, limiting the maximum transmission block size which can be used by the UE.
However, for the UE under CELL _ FACH, no matter whether it is at the CELL edge, the E-DCH uplink transmission in the enhanced uplink access process of the UE is limited by the maximum transport block, thereby limiting the throughput of E-DCH in the enhanced uplink access process of the whole CELL and increasing the delay of message transmission.
In order to reduce the interference of cell edge users to the adjacent cell, another solution in the prior art is: the serving Node B estimates the path loss from the UE to the adjacent cell and the interference condition of the UE to the adjacent cell according to the UPH (Uplink Power Headroom) and CQI (Channel Quality Indicator) information reported by the UE, so that the serving Node B controls Uplink transmission of the UE and reduces interference to the adjacent cell.
However, UPH is determined by the path loss of the UE to the serving cell, and has a poor correlation with the path loss of the UE to the neighbor cell. Therefore, the path loss from the UE to the neighboring cell estimated by the UPH information is inaccurate, and the actual path loss from the UE to the neighboring cell cannot be reflected, which may cause the serving Node B to be unable to accurately control the interference of the UE to the neighboring cell.
The CQI is obtained from factors such as signal strength measurement of a CPICH (Common Pilot Channel) serving cell, interference of other base stations, and decoding capability of the UE. The CQI is an average over several channel-related times and is related to a specific channel type and receiver type, so the Node B has a great uncertainty in estimating the actual path loss of the UE to the neighboring cell and the interference situation to the neighboring cell according to the CQI information reported by UEs of different channel types or receiver types. Moreover, the transmitting power of each Node B is different under the mixed configuration, and the estimation of the actual path loss from the UE to the adjacent cell and the interference situation to the adjacent cell by the UE through the CQI information obtained by measuring the CPICH signal strength of the Node bs with different power configurations also has a great uncertainty. Therefore, the NodeB may not accurately control the interference of the UE to the neighbor cell according to the CQI information.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method, an apparatus, and a system for controlling interference of a UE to a neighboring cell, so as to effectively control the interference of the UE to the neighboring cell.
The embodiment of the invention provides a method for controlling interference of UE to an adjacent cell, which comprises the following steps:
receiving a UE measurement result sent by the UE through an MAC data packet or uplink scheduling information;
and controlling the interference of the UE to the adjacent cell according to the measurement result of the UE.
The embodiment of the invention also provides a device for controlling the interference of the UE to the adjacent cell, which comprises:
a receiving unit, configured to receive a measurement result of the UE sent by the UE through the MAC packet or the uplink scheduling information;
and the control unit is used for controlling the interference of the UE to the adjacent cell according to the measurement result received by the receiving unit.
The embodiment of the invention also provides a system for controlling the interference of the UE to the adjacent cell, which comprises the UE and the Node B,
the UE is used for sending the measurement result of the UE to the Node B through the MAC data packet or the uplink scheduling information;
and the Node B is used for receiving the measurement result sent by the UE and controlling the interference of the UE on the adjacent cell according to the measurement result.
Compared with the prior art, the method, the device and the system provided by the embodiment of the invention can ensure that the UE can send the measurement result of the UE to the Node B when the uplink access is enhanced, and further the Node B can control the interference of the UE to the adjacent cell in the process of enhancing the uplink access.
Drawings
FIG. 1 is a schematic flow chart of a method according to a first embodiment of the present invention;
FIG. 2 is a diagram illustrating a MAC-i PDU format according to a first embodiment of the present invention;
FIG. 3 is a diagram illustrating a header format of a MAC control unit according to an embodiment of the present invention;
FIG. 4 is a flowchart illustrating a method according to a second embodiment of the present invention;
FIG. 5 is a diagram illustrating a format of uplink scheduling information in the prior art
Fig. 6 is a schematic diagram illustrating a format of uplink scheduling information according to a second embodiment of the present invention;
FIG. 7 is a schematic structural diagram of an apparatus according to a third embodiment of the present invention;
fig. 8 is a schematic structural diagram of a system according to a fourth embodiment of the present invention.
Detailed Description
The embodiment of the invention discloses a method for controlling inter-cell interference, and a Node B can judge the interference condition of UE to an adjacent cell according to a measurement result reported by the UE, thereby realizing the control of the uplink transmission of the UE.
Example one
The embodiment of the invention provides a method for controlling inter-cell interference. In the method, UE sends the measurement result of the UE to Node B through an MAC data packet; and the Node B controls the transmission format which can be adopted by the uplink transmission of the UE according to the received measurement result, thereby realizing the control of the interference of the UE on the adjacent cell. The present embodiment is described in detail below with reference to fig. 1. As shown in figure 1:
101, sending the MAC packet carrying the UE measurement result to Node B.
The inventor of the present invention finds out through analysis that the CPICH Ec/N0(CPICH received signal-to-noise ratio), CPICH RSCP (CPICH received signal code power) or Path-loss of the present cell and the neighbor cell can estimate whether the UE is currently at the edge of the cell, and thus can estimate the interference degree of the UE to the neighbor cell. However, in the prior art, although the UE in the CELL _ FACH state can measure cpich ec/N0, CPICH RSCP and Path-loss of the local CELL and the neighboring CELL during the measurement of the co-frequency and the inter-frequency, the UE in the CELL _ FACH state does not report these measurement results, but determines whether to initiate CELL update according to the measurement results.
The UE performing enhanced uplink random access is also in CELL _ FACH state. Therefore, although the UE performing the enhanced uplink random access can measure CPICH Ec/N0, CPICH RSCP and Path-loss of the own cell and the neighboring cell, the measurement result cannot be reported to the Node B. The Node B cannot use the measurement result to control the interference of the UE to the neighbor cell.
Therefore, in the embodiment of the present invention, the measurement result of the UE (the measurement result is at least one of CPICH Ec/N0, CPICH RSCP, Path-loss of the local cell and the neighboring cell) is sent to the Node B by the MAC packet. In order to send the measurement result of the UE to the Node B through the MAC packet, in the embodiment of the present invention, an MAC-i entity is added in the MAC layer for carrying the measurement result of the UE. One implementation manner of the MAC-i entity may be: and the MAC-e entity in the prior art is enhanced to form the MAC-i entity. Thus, the measurement result of the UE can be packed into MAC-i PDU (Protocol Data Unit) in the MAC-i entity, and sent to the Node B through MAC-i PDU in the collision resolution stage and/or Data transmission stage.
Specifically, the measurement result of the UE may be carried by a MAC control element in the MAC-i PDU. An example of a MAC-i PDU structure is shown in FIG. 2: each of which may be used to carry a control information. Therefore, the measurement result of the UE can be transmitted as control information to the Node B through the MAC control element. In the MAC-i PDU structure shown in FIG. 2, the MAC-isPDU is the load of the MAC-i PDU; padding is Padding bits.
Accordingly, a MAC control unit header needs to be added to the MAC-i header. An example of the structure of the MAC control unit header is shown in fig. 3: wherein a 4-bit long "special logical channel identification" is used to identify that the portion is a MAC control unit header instead of a data unit header. The "flag" of the next 4 bits can be used to indicate whether 4 MAC control elements are present at most (e.g., '0' indicates presence and '1' indicates absence). In this way, each MAC control element may be transmitted simultaneously or separately. All MAC control elements, if present, can be placed in the payload part of the MAC-i PDU, which ensures byte alignment of the MAC-i header (i.e., the number of bits of the MAC-i header remains unchanged). It will be understood by those skilled in the art that when the number of required MAC control elements is more than 4, the number of bits of the "identity" following the "special logical channel identity" can be increased accordingly.
Thus, when the measurement results of a UE are carried with a MAC control element in a MAC-i PDU, a corresponding "identity" is added in the corresponding MAC control element header to indicate the presence of that MAC control element.
102, Node B controls the interference of UE to the adjacent cell according to the measurement result in the received MAC-i PDU.
In this step, after the Node B receives the MAC-i PDU carrying the UE measurement result and obtains the measurement result of the UE, the serving grant (ServingGrant) that the UE can obtain is controlled through the downlink scheduling channel. And after the UE obtains the corresponding SG, selecting the corresponding uplink transmission format according to the SG. Thus, the Node B can control the uplink transmission of the UE, thereby controlling the interference of the UE to the adjacent cell.
In the embodiment of the invention, the measurement result of the UE is sent to the Node B through the MAC-i PDU, thereby not only controlling the interference of the UE to the adjacent cell, but also greatly shortening the time delay of the network side for scheduling the UE.
In the above embodiment, the content of the measurement result sent by the UE to the Node B via the MAC-i PDU may be one or more of CPICH Ec/N0, CPICH RSCP, Path-loss of the UE's own cell and neighbor cell. Of course, the content of the measurement result sent by the UE to the Node B is not limited in this invention, but also the result of comparing the CPICH Ec/N0, CPICH RSCP and Path-loss of the own cell and the neighbor cell (such as the minimum Path-loss difference between the own cell and the neighbor cell).
Alternatively, one or more measurement threshold values may be configured according to the parameters measured by the UE (for example, one or more of CPICH Ec/N0, CPICH RSCP, and Path-loss of the local cell and the neighboring cell; or a comparison result of CPICH Ec/N0, CPICH RSCP, and Path-loss of the local cell and the neighboring cell), and when the parameters measured by the UE exceed the threshold values, the measurement event is reported (in this case, the measurement event may also be regarded as a measurement result). Thereby triggering the scheduling of Node B to UE to control the interference of UE to the adjacent cell.
Example two
The embodiment of the invention also provides a method for controlling the inter-cell interference. In the method, the measurement result of the UE can also be sent to the Node B through uplink scheduling information; and the Node B controls the interference of the UE to the adjacent cell according to the measurement result in the received uplink scheduling information. The flow of the present embodiment is described in detail below with reference to fig. 4. As shown in fig. 4:
401, the UE sends uplink scheduling information carrying the UE measurement result to the Node B.
Fig. 5 shows a format of uplink scheduling information in the prior art. As shown in fig. 5, in the prior art, uplink scheduling information sent by a UE includes HLID (high priority Logical channel ID, Highest priority Logical channel ID), TEBS (Total E-DCH Buffer Status, E-DCH Buffer Status), HLBS (high priority Logical channel Buffer Status, Highest priority Logical channel Buffer Status), and UPH (UE Power Headroom).
In order to send the measurement result of the UE to the Node B through the uplink scheduling information, a domain may be added to the existing scheduling information format to carry the control information related to the UE measurement. As shown in fig. 6, an SNMI (Serving and neighbor cell measurement Information) field is added to the existing scheduling Information format to carry the measurement Information of the Serving cell and the neighbor cell of the UE.
In this example, the SNMI domain is represented by 5 bits. Of course, the size of the SNMI domain may be selected as desired.
402, Node B controls the interference of UE to the adjacent cell according to the measurement result carried in the received scheduling information.
In this step, the Node B can accurately estimate the interference degree of the UE to the neighboring cell according to the measurement result, and then control the uplink transmission of the UE by scheduling, thereby controlling the interference of the UE to the neighboring cell. One scheduling example is: controlling SG which can be obtained by UE through a downlink scheduling channel; after the corresponding SG is obtained, the UE selects the corresponding transmission format according to the SG. Thus, Node B can control the uplink transmission of UE, thereby controlling the interference of UE to the adjacent cell
The content of the measurement result sent by the UE to the Node B through the uplink scheduling information may be:
one or more of CPICH Ec/N0, CPICH RSCP and Path-loss of the cell and the adjacent cell; or
Comparing the CPICH Ec/N0, CPICH RSCP and Path-loss of the cell with the neighbor cell (such as the minimum Path-loss difference between the cell and the neighbor cell); or
One or more measurement thresholds are configured according to the parameters measured by the UE (e.g. one or more of CPICH Ec/N0, CPICHRSCP, Path-loss of the local cell and the neighboring cell; or the comparison result of CPICH Ec/N0, CPICH RSCP, Path-loss of the local cell and the neighboring cell), and when the parameters measured by the UE exceed the thresholds, the measurement event is reported (in this case, the measurement event can also be regarded as a measurement result).
EXAMPLE III
The embodiment of the invention also provides a device for controlling the interference among the cells. The device is used for receiving the measurement result of the UE carried by the MAC data packet or the uplink scheduling information and controlling the interference of the UE to the adjacent cell according to the received measurement result of the UE. Generally, the functions performed by the apparatus for controlling inter-cell interference may be implemented by a Node B in a communication system.
The present embodiment is described in detail below with reference to fig. 7. As shown in fig. 7, the apparatus comprises:
a receiving unit 701, configured to receive a measurement result of the UE carried by the MAC packet or the uplink scheduling information;
a control unit 702, configured to control interference of the UE on the adjacent cell according to the measurement result of the UE received by the receiving unit 701.
The measurement result of the UE may be carried in the MAC control element in the MAC packet; or in the SNMI domain of the uplink scheduling information. For a method for implementing that the measurement result of the UE is carried in the MAC control element in the MAC packet or in the SNMI domain of the uplink scheduling information, reference may be made to the description in the first and second embodiments, which is not repeated herein.
Specifically, the control unit 702 is configured to control an SG available to the UE through a downlink scheduling channel according to a measurement result of the UE. And after the UE obtains the corresponding SG, selecting the corresponding transmission format according to the SG to carry out uplink transmission. Therefore, the uplink transmission of the UE can be controlled, and the interference of the UE to the adjacent cell can be controlled.
The content of the measurement result of the UE carried by the MAC packet or the uplink scheduling information may be:
one or more of CPICH Ec/N0, CPICH RSCP and Path-loss of the cell and the adjacent cell; or
Comparing the CPICH Ec/N0, CPICH RSCP and Path-loss of the cell with the neighbor cell (such as the minimum Path-loss difference between the cell and the neighbor cell); or
Configuring one or more measurement threshold values according to the UE measured parameters (such as one or more of CPICH Ec/N0, CPICHRSCP, Path-loss of the cell and the adjacent cell; or the comparison result of CPICH Ec/N0, CPICH RSCP and Path-loss of the cell and the adjacent cell), and reporting the measurement event when the UE measured parameters exceed the threshold value (in this case, the measurement event can also be regarded as a measurement result)
Example four
The embodiment of the invention also provides a system for controlling the inter-cell interference. As shown in FIG. 7, the system includes a UE801 and a Node B802. Wherein,
UE801, configured to send a measurement result of the UE to Node B802 through a MAC packet or uplink scheduling information;
a Node B802, configured to receive a measurement result of the UE801 sent by the UE801 through the MAC packet or the uplink scheduling information, and control interference of the UE801 to the adjacent cell according to the measurement result.
Wherein, the measurement result of the UE801 may be carried in the MAC control element in the MAC packet; or in the SNMI domain of the uplink scheduling information. The method for implementing the measurement result of the UE801 to be carried in the MAC control element in the MAC packet or in the SNMI domain of the uplink scheduling information may be described in association with embodiments one and two, and is not repeated here.
Specifically, the Node B802 is configured to receive a measurement result of the UE801 sent by the UE801 through the MAC packet or the uplink scheduling information; and controls SG available to the UE801 through a downlink scheduling channel according to the measurement result of the UE 801. After the UE801 obtains the corresponding SG, it selects the corresponding transport format according to the SG to perform uplink transmission. Thus, the Node B802 may control the uplink transmission of the UE801, thereby controlling the interference generated by the UE801 to the neighboring cell.
The content of the measurement result of the UE801 carried by the MAC packet or the uplink scheduling information may be:
one or more of CPICH Ec/N0, CPICH RSCP and Path-loss of the cell and the adjacent cell; or
Comparing the CPICH Ec/N0, CPICH RSCP and Path-loss of the cell with the neighbor cell (such as the minimum Path-loss difference between the cell and the neighbor cell); or
Configuring one or more measurement threshold values according to the parameters measured by the UE801 (such as one or more of CPICH Ec/N0, CPICH RSCP, Path-loss of the cell and the neighbor cell; or the comparison result of CPICH Ec/N0, CPICH RSCP, Path-loss of the cell and the neighbor cell), and reporting the measurement event when the measured parameters of the UE801 exceed the threshold values (in this case, the measurement event can also be regarded as a measurement result)
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (15)
1. A method for controlling UE to adjacent cell interference, the method comprising:
receiving a UE measurement result sent by the UE through an MAC data packet or uplink scheduling information;
and controlling the interference of the UE to the adjacent cell according to the measurement result of the UE.
2. The method of claim 1, wherein the measurement result of the UE is carried in a MAC control element of the MAC packet when the measurement result of the UE is transmitted through the MAC packet.
3. The method of claim 1, wherein the measurement result of the UE is carried in one domain of the uplink scheduling information when the measurement result of the UE is transmitted through the uplink scheduling information.
4. The method of claim 1, wherein the measurement result of the UE is: and the UE measures the results of the downlink common pilot channel CPICH of the cell and the adjacent cell.
5. The method of any one of claims 1-4, wherein the controlling interference of the UE to the neighbor cell comprises:
and controlling the service authorization obtained by the UE through a downlink scheduling channel, wherein the service authorization is used for controlling the UE to select an uplink transmission format.
6. The method of any one of claims 1-4, wherein the content of the measurement results comprises:
one or more of the local cell and the adjacent cell CPICH Ec/N0, CPICH RSCP and Path-loss of the UE; or
The comparison result of the local cell of the UE and one or more of the adjacent cells CPICH Ec/N0, CPICH RSCP and Path-loss; or
And when the measurement result of the UE exceeds a preset threshold, reporting a measurement event.
7. The method of any of claims 1-4, wherein the UE is in a CELL FACH state.
8. An apparatus for controlling UE-to-cell interference, the apparatus comprising:
a receiving unit, configured to receive a measurement result of the UE sent by the UE through the MAC packet or the uplink scheduling information;
and the control unit is used for controlling the interference of the UE to the adjacent cell according to the measurement result received by the receiving unit.
9. The apparatus of claim 8,
the measurement result received by the receiving unit is carried in the MAC control unit in the MAC data packet or in a domain of the uplink scheduling information.
10. The apparatus of claim 8, wherein the measurement result of the UE is a measurement result of a downlink common pilot channel CPICH of the local cell and the neighboring cell by the UE.
11. The apparatus of any one of claims 8-10, wherein the content of the measurement results comprises:
one or more of the local cell and the adjacent cell CPICH Ec/N0, CPICH RSCP and Path-loss of the UE; or
The comparison result of the local cell of the UE and one or more of the adjacent cells CPICH Ec/N0, CPICH RSCP and Path-loss; or
And when the measurement result of the UE exceeds a preset threshold, reporting a measurement event.
12. A system for controlling interference of UE to adjacent cells, the system comprises the UE and a Node B,
the UE is used for sending the measurement result of the UE to the Node B through the MAC data packet or the uplink scheduling information;
and the Node B is used for receiving the measurement result sent by the UE and controlling the interference of the UE on the adjacent cell according to the measurement result.
13. The system of claim 12 wherein the measurement results received by the Node B are carried in a MAC control element in the MAC packet or in a field of the uplink scheduling information.
14. The system of claim 12, wherein the measurement result of the UE is a measurement result of a downlink common pilot channel CPICH of the local cell and the neighboring cell by the UE.
15. The system of any of claims 12-14, wherein the content of the measurement results comprises:
one or more of the local cell and the adjacent cell CPICH Ec/N0, CPICH RSCP and Path-loss of the UE; or
The comparison result of the local cell of the UE and one or more of the adjacent cells CPICH Ec/N0, CPICH RSCP and Path-loss; or
And when the measurement result of the UE exceeds a preset threshold, reporting a measurement event.
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