WO2013171577A1 - Method of configuring discontinuous reception mode parameters - Google Patents

Method of configuring discontinuous reception mode parameters Download PDF

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Publication number
WO2013171577A1
WO2013171577A1 PCT/IB2013/001140 IB2013001140W WO2013171577A1 WO 2013171577 A1 WO2013171577 A1 WO 2013171577A1 IB 2013001140 W IB2013001140 W IB 2013001140W WO 2013171577 A1 WO2013171577 A1 WO 2013171577A1
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WIPO (PCT)
Prior art keywords
discontinuous reception
parameters
traffic
base station
reception parameters
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PCT/IB2013/001140
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French (fr)
Inventor
Pingping Wen
Chandrika Worrall
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Alcatel Lucent
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Publication date
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Publication of WO2013171577A1 publication Critical patent/WO2013171577A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave using a pre-established activity schedule, e.g. traffic indication frame
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the invention relates to wireless communication, and particularly relates to discontinuous reception (DRX) in wireless communication.
  • DRX a very useful mechanism for saving the battery power consumption of a UE.
  • Using the DRX applicable for lower real time, e.g. long cycle DRX can efficiently decrease the UE power consumption, e.g. when the DRX cycle is 640 ms long, the UE power consumption can reach the level of the power consumption in idle mode.
  • proper DRX parameters e.g. the parameters of DRX cycle, ON time, inactivity timer length etc.
  • the existing DRX mechanism can efficiently save UE power consumption.
  • the key issue is to how selecting proper DRX parameters.
  • the proposal R2-121465 proposes that: the eNB provides a series of DRX parameters to a UE. Since the UE knows most what traffic is running, how is its data packets arrival distribution, and other cross layer information, the UE can select the most suitable DRX parameters from the series of DRX parameters, and inform the eNB of an index of the selected parameter. The eNB takes the UE selection into account and combines related factors (e.g. network load etc.), and configures final DRX parameters (selected by the UE, or changed by the eNB) for the UE.
  • related factors e.g. network load etc.
  • the battery status information of a UE can also be provided to an eNB, so that the eNB determines DRX parameters configuration.
  • the eNB may configure DRX parameters suitable for a higher real time characteristic, while if the UE has limited battery, the eNB performs optimization to DRX parameters, e.g. configuring DRX parameters suitable for a lower real time characteristic to save battery and make the standby time of a UE longer.
  • R2-121465 proposed using battery level
  • LG Electronics proposed that using power connection indication to report battery information, but they can't reflect the battery condition of a user.
  • the eNB can't determine whether a UE only has background traffic, and the eNB doesn't support different DRX parameters configuration for the scenarios of with only background traffic, and with background traffic and other traffic.
  • the solution in current standardization proposals must be that: at the UE side, the most suitable DRX parameters are selected according to collected information. And the UE also needs to take a long time to monitor traffic situation and obtain statistical results of arrival distribution of data packets etc., and only after that the UE is enabled to select suitable DRX parameters according to these statistical results.
  • one disadvantage of standardization proposals is that the UE needs to implement more complex operation, and it is also very time consuming.
  • a method in a base station, used for configuring discontinuous reception parameters of a UE, comprising the following steps: receiving an indication transmitted by the UE, the indication indicating that the UE only has first type traffic; determining the discontinuous reception parameters matched with the first type traffic; transmitting to the UE the discontinuous reception parameters matched with the first type traffic.
  • the UE may perform communications based on the discontinuous reception parameters, and determine the corresponding communication performance, and based on the communication performance, the UE may determine whether it is needed to adjust the discontinuous reception parameters, and transmit to the base station an indication of needing to adjust the parameters.
  • the advantage of this aspect is that, since the UE knows that only the first type traffic is running currently, the base station can determine DRX parameters matched with the first type traffic according to a report of a UE, and the configured parameters are adjusted progressively by the UE observing its communication performance, without requiring the UE to define selection rules and make selections, thereby sparing the time needed for monitoring the traffic situation.
  • the method further comprises the following steps: receiving an indication transmitted by the UE, the indication indicating that the UE has first type traffic and second type traffic; determining the discontinuous reception parameters matched with the first type traffic and the second type traffic; transmitting to the UE the discontinuous reception parameters matched with the first type traffic and the second type traffic.
  • the advantage of this aspect is that, since the UE knows that the first type traffic and the second type traffic are simultaneously running currently, the base station can determine the matched DRX parameters to meet the needs of the second type traffic according to the report of the UE.
  • the discontinuous reception parameters matched with the first type traffic comprises at least two sets of parameters, from which the determining step determines one set of parameters according to a certain rule,
  • the method further comprises the following steps:
  • the advantage of the embodiment is that, the DRX parameters is adjusted according to the feedback signaling of the UE, so that it can conform to the actual communication performance of the UE, and thus is more accurate.
  • the method further comprises the following steps:
  • the related factors comprise:
  • the advantage of this embodiment is that, the eNB may determine whether the DRX parameters are suitable for the UE according to the downlink communication performance at the base station, and implement corresponding adjustment, which is more accurate.
  • the certain rule is any one of the following:
  • the method further comprises the following steps before the receiving step:
  • the initial DRX parameters determined by the base station are used for the traffic scenario of coexisting background traffic and active traffic.
  • the first type traffic includes background traffic
  • the second type traffic includes active traffic
  • the discontinuous reception parameters matched with the background traffic are suitable for a lower real time characteristic, wherein the parameters have at least any one of the following characteristics:
  • the discontinuous reception parameters matched with the scenario, in which the background traffic and the active traffic coexist, are suitable for a higher real time characteristic, wherein the parameters have at least any one of the following characteristics:
  • the embodiment provides better DRX parameters respectively for different traffic scenarios, maintains the real time characteristic of traffic and optimizes power consumption.
  • UE used for configuring discontinuous reception parameters, comprising the following steps: transmitting an indication to a base station, the indication indicating that the UE only has first type traffic; receiving and configuring the discontinuous reception parameters, transmitted by the base station, matched with the first type traffic.
  • the method further comprises the following steps: transmitting an indication to the base station, the indication indicating that the UE has first type traffic and second type traffic; receiving and configuring the discontinuous reception parameters, transmitted by the base station, matched with the first type traffic and the second type traffic.
  • the method further comprises the following steps: communicating based on the discontinuous reception parameters, and determining corresponding communication performance; based on the communication performance, determining whether it is needed to adjust the discontinuous reception parameters; when it is needed, transmitting a signaling to the base station, the signaling used for requesting to adjust the discontinuous reception parameters.
  • operations of said determining the communication performance comprise at least any one of: - checking a data amount of data to be transmitted in a buffer;
  • operations of said determining whether it is needed to adjust comprise:
  • the advantage of the embodiment is that, the UE can determine whether it is needed to adjust DRX parameters according to the communication performance on the basis of the current DRX parameters, thereby making the DRX parameters meet the actual condition of the UE. Additionally, the communication performance can be measured by the UE easily, thus it would not excessively increase the complexity of the UE.
  • the method further comprises the following steps before the transmitting step:
  • the advantage of the embodiment is that, since DRX parameters are determined by a base station, the DRX parameters determined by the base station by default are for the traffic scenario of the mixed first type traffic and second type traffic. When satisfying the scenario, the UE may use the parameters directly and spare the report process.
  • Another disadvantage of the existing technology is that only the characteristics of the battery currently used can be reflected, while the power consumption preference of the user can not. E.g. a user has a spare battery, and he needs communication performance of a higher real time characteristic, while none of the current UE and eNB can obtain this condition and do the corresponding processing.
  • the invention further provides a method used for configuring discontinuous reception parameters in a base station, the method comprises the following steps: receiving from the UE a power consumption preference of a user; determining the discontinuous reception parameters of the UE, according to the power consumption preference; sending the discontinuous reception parameters to the UE.
  • the invention further provides a method, in a UE, used for configuring discontinuous reception parameters, comprising the following steps: receiving a power consumption preference input by a user; receiving the discontinuous reception parameters from a base station;
  • a base station and UE can configure more suitable DRX parameters according to the power consumption preference of a user, thus improving the flexibility of communication system.
  • Fig.l shows the diagram of waiting delay in various traffic scenarios according to an embodiment of the invention.
  • Fig.2 shows the diagram of waiting delay in various traffic scenarios according to another embodiment of the invention.
  • the eNB determines initial discontinuous reception parameters based on at least any one of the following conditions:
  • the eNB doesn't know the traffic situation of a UE, thus in general, the DRX parameters determined by the eNB are configured based on the QoS requirement of radio bearer to which the traffic maps, and these parameters are used in the traffic scenarios of coexisting background traffic and active traffic.
  • the eNB sends the initial discontinuous reception parameters to the eNB.
  • the UE knows the traffic running on it, when the UE currently runs background traffic and active traffic at the same time, since the DRX parameters determined by the eNB are suitable for the traffic scenario of the UE, the UE directly uses the initial discontinuous reception parameters to communicate; and when the UE only runs background traffic, the DRX parameters may be unmatched with background traffic, e.g. the DRX is suitable for a higher real time characteristic, there will be a certain waste of power when the DRX is used for background traffic of a lower real time characteristic.
  • the UE sends an indication to the eNB, the indication indicates that the UE only has background traffic.
  • the indication may be transported by MAC signaling.
  • the eNB receives the indication, and determines the DRX parameters matched with the first type traffic, then, the eNB provides the DRX parameters to the UE.
  • the UE After receiving the DRX parameters, the UE configures the parameters to finish the setup process.
  • the UE communicates based on the DRX parameters.
  • the UE in the first hour (0-lhOm), the UE only has background traffic, thus the DRX cycle in the DRX parameters (para. 1) selected by the eNB for the UE is 1024ms, and the delay is shown as fig. 1.
  • the UE later, in the second hour (Ih0m-2h0m), except for the background traffic already running, the UE further starts an active traffic.
  • Both of the two traffics may be mapped to the same or different radio bearer (RB).
  • RB radio bearer
  • the UE sends the eNB an indication, the indication indicates that the UE has background traffic and active traffic, and the eNB receives the indication.
  • the eNB determines the DRX parameters matched with the background traffic and active traffic, and sends the DRX parameters to the UE, the UE receives and configures the DRX parameters.
  • the UE communicates based on the DRX parameters.
  • the UE has background traffic and active traffic, thus the DRX cycle in the DRX parameters (para. 2) which the eNB selects for the UE is 32ms, so as to ensure the requirement of a real time characteristic for the active traffic, and the delay is as shown in fig. 1.
  • the active traffic finishes, and the UE only has background traffic again.
  • the UE sends the eNB an indication, the indication indicates the UE only has background traffic, the eNB receives the indication.
  • the eNB determines the DRX parameters matched with the background traffic, and sends the DRX parameters to the UE.
  • the UE receives and configures the DRX parameters.
  • the UE communicates based on the DRX parameters.
  • the UE only has background traffic, thus the DRX cycle in the DRX parameters which the eNB selects for the UE is 1024ms, to ensure the requirement of a real time characteristic for the active traffic, and the delay is shown in fig. 1.
  • the UE respectively starts again and terminates an active traffic.
  • the eNB configures for the UE respectively the DRX cycle of 32ms and the DRX cycle of 1024ms, and the delays are shown in fig. 1.
  • the DRX parameters configured by the eNB for the traffic scenario with only background traffic are the same.
  • the eNB can select one from at least two sets of DRX parameters for the traffic scenario with only background traffic, and configure the selected parameters. The following will describe the embodiment.
  • the eNB does not know the traffic condition of a UE, thus, in general, the DRX parameters determined by the eNB are used in the traffic scenario of coexisting background traffic and active traffic.
  • the eNB sends the initial discontinuous reception parameters to the eNB.
  • the DRX parameters should be unmatched with background traffic, e.g. the DRX is suitable for a higher real time characteristic, and there is a certain waste of power when this DRX parameter is used for background traffic 1 of lower real time characteristic.
  • the UE sends an indication to the eNB, the indication indicates that the UE only has background traffic.
  • the indication may be transported by MAC signaling.
  • the eNB receives the indication, and determines, from multiple DRX parameters, the DRX parameters matched with the background traffic. As described in more details below, the UE can feed back according to the communication performance on the basis of this determined DRX parameters, and finally determines the final DRX parameters. Thus, when determining this DRX parameters, the eNB can determine from the candidate sets of DRX parameters suitable for background traffic according to their properness to high or low real time characteristic, e.g.
  • the eNB prefers to select the DRX parameters suitable for a higher real time characteristic; in another example, in order to make the UE to save power, the eNB prefers to select the DRX parameters suitable for a lower real time characteristic; or, the eNB may select randomly. After that, the eNB provides this DRX parameters to the UE.
  • the UE After receiving this DRX parameters, the UE configures this DRX parameters, and finishes the configuring process.
  • the UE communicates based on this DRX parameters.
  • the eNB selects a DRX parameter suitable for a lower real time characteristic in the candidate sets of DRX parameters suitable for background traffic.
  • the DRX parameter configured by the eNB for a UE in a priority is parameter 1 (para. 1), and the DRX cycle in the parameter is 1024ms.
  • the UE communicates based on this DRX parameter, which is shown in a short time in the beginning of the first hour (OhOm-lhOm), and the maximum delay is 1024ms.
  • the UE further observes the communication performance of the UE's communication based on the DRX parameter.
  • the UE can check a data amount of data to be transmitted in a buffer, and/or check a delay of data to be transmitted.
  • the UE determines whether or not it is needed to adjust the discontinuous reception parameters.
  • the UE can:
  • the background traffic 1 has a larger data amount of data and is more frequent.
  • the DRX cycle is 1024ms, it will leads to that the data amount in a buffer is excessive and the data delay is longer.
  • the UE determines that it's needed to adjust DRX to suit a higher real time characteristic.
  • the UE transmits a signaling to the eNB, the signaling is used for requesting to adjust the discontinuous reception parameters to suit higher real time characteristic.
  • the signaling can be transported via a MAC signaling.
  • the eNB After the eNB receives the signaling, it can combine this signaling with related factors to determine the final discontinuous reception parameters of the UE. E.g. in the embodiment, the eNB can configure a DRX parameter 2 (para. 2) to the UE, and the DRX cycle is shortened from 1024ms to 640ms, which is shown in a period of time at the end of the first hour.
  • a DRX parameter 2 para. 2
  • the UE further starts active traffic. Then similar with the previous embodiment, the UE sends an indication to the eNB, the indication indicates the UE has background traffic and active traffic.
  • the eNB configures the DRX parameter 3 (para. 3) for the UE, wherein the DRX cycle is 32ms, to meet the requirement of a real time characteristic for the active traffic. The delay is shown in the second hour in fig. 2.
  • the UE terminates the active traffic and background traffic 1, and starts background traffic 2.
  • the UE sends an indication to the eNB, and the indication indicates the UE only has background traffic.
  • the eNB receives the indication.
  • the eNB determines the DRX parameters matched with the background traffic.
  • the eNB selects a DRX parameter suitable for a lower real time characteristic in the candidate sets of DRX parameters suitable for background traffic, i.e. the DRX parameter configured for a UE is parameter 1.
  • the UE communicates based on the DRX parameter 1.
  • the UE further determines the communication performance of the UE's communication on the basis of the DRX parameter 1.
  • the UE can check a data amount of data to be transmitted in a buffer, and/or check a delay of data to be transmitted.
  • the background traffic 2 has a less data amount of data and is less frequent.
  • the DRX cycle is 1024ms
  • the data amount in a buffer and the data delay are all proper.
  • the UE determines that it's not needed to adjust DRX parameter.
  • the eNB since previously, the DRX parameter finally configured by the eNB for the UE with only having background traffic is parameter 2, the eNB may record the parameter. In the third hour, this DRX parameter 2 is configured for the UE.
  • the UE communicates based on the DRX parameter 2, which is shown as a short time in the beginning of the third hour.
  • the UE further determines the communication performance of the UE's communication on the basis of the DRX parameter.
  • the UE can check a data amount of data to be transmitted in a buffer, and/or check a delay of data to be transmitted.
  • the background traffic 2 has a less data amount of data and is less frequent.
  • the DRX cycle is 640ms
  • the data amount in a buffer is less and the data delay is shorter.
  • the UE can determine that it's needed to adjust DRX to suit the lower real time characteristic.
  • the UE transmits a signaling to the eNB, the signaling is used for requesting to adjust the discontinuous reception parameters to suit lower real time characteristic.
  • the signaling can be transported via a MAC signaling.
  • the eNB After the eNB receives the signaling, it can combine this signaling with related factors to determine the final discontinuous reception parameters of the UE. E.g. in the embodiment, the eNB can configure DRX parameter 1 to the UE, namely the DRX cycle is lengthened from 640ms to 1024ms, which is shown in a period of time at the end of the third hour. The maximum delay is 1024ms.
  • the UE respectively starts active traffic again, and terminates the active traffic.
  • the eNB configures for the UE the DRX cycle of 32ms and the DRX cycle of 1024ms respectively, and the delay is shown in fig. 2.
  • the UE requests to adjust DRX parameters according to communication performance.
  • the eNB may automatically adjust DRX according to communication performance, e.g. the eNB can determine whether or not the buffered data amount or delay of downlink data of the UE is oversized or undersized, and adjust DRX parameters to make them suit higher or lower real time characteristic according to the performance.
  • the battery level and charge status exchanged by the UE and the eNB can't reflect the actual preference of a user.
  • the user with high power UE needs to save as much power as possible, since he can not replace or charge his battery in a period time; or the user with low power UE does not need to save power, but needs shorter delay, since he has a spare battery or he can charge his battery.
  • the UE receives a power consumption preference inputted by a user, and sends the power consumption preference to the eNB.
  • the eNB can determine the discontinuous reception parameters of the UE, according to the power consumption preference, and send the discontinuous reception parameters to the UE.
  • the eNB can determine to use the DRX parameters of longer DRX cycle; while when the power preference needn't to save power, the eNB can determine to use the DRX parameters of shorter DRX cycle.
  • the UE communicates based on the discontinuous reception parameters transmitted by the base station, and determines corresponding communication performance.
  • the UE receives the power consumption preference inputted by a user, and determines whether it is needed to request the base station to adjust the discontinuous reception parameters, based on the power consumption preference and the communication performance. E.g. when the delay is too high, and the power preference needn't save power, the UE can send an adjusting signaling; while when the power preference needs to save power, the UE doesn't send the signaling.
  • the technicians familiar with the field may make all kinds of corresponding changes and deformations according to the invention, while the corresponding changes and deformations should belong to the protect range of the claims attached by the invention.
  • E.g. several sets of DRX parameters suitable for background traffic further comprise different ON time and inactivity timers.
  • the ordinary technicians in the field may understand all or partial steps in the above methods through programs commanding related hardware to achieve, the programs may be stored in readable storage medium of a computer, e.g. a read-only memory, disk or CD-ROM etc.
  • all or partial steps in the above embodiments may use one or multiple integrated circuits to achieve.
  • each module/unit in the above embodiments may take the hardware form to realize, either take the form of software function module to achieve.
  • the invention isn't limited to any specific forms of combination of hardware and software.

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Abstract

When configuring DRX parameters, the UE with only background traffic should configure long DRX. But in the existing technology, the base station can't determine whether a UE only has background traffic. The invention provides a method of configuring discontinuous reception parameters, wherein the UE sends an indication to the base station, the indication indicating that the UE only has a first type traffic, e.g. background traffic; after determining DRX configuration matched with the first type traffic, the base station sends this configuration to the UE; and the UE configures the discontinuous reception parameters. The advantage of the solution is that, since the UE knows that only the first type traffic is running currently, the base station can determine the DRX configuration matched with the first type traffic according to the report of the UE. Preferably, the UE or the base station can determine whether it is needed to adjust DRX configuration, according to the communication performance observed based on the DRX configuration previously determined, the operations are easily performed and strong flexibility is achieved.

Description

Method of configuring discontinuous reception mode parameters Technical field The invention relates to wireless communication, and particularly relates to discontinuous reception (DRX) in wireless communication.
Background technology
The types of devices utilizing the current mobile communication network continue to grow, comprising smart phones, laptops, netbooks, tablet devices and embedded modems etc. Many devices are capable of running a variety of data applications, and often in parallel. Such diversity in devices and applications correspondingly generates multiple traffic types which should all be efficiently supported by radio access networks which bear the traffic. Therefore, in RAN#51 meeting, a work item of LTE RAN for the enhancing diverse data application (EDDA) was approved to set up.
One important topic in EDDA is the power consumption issue. At present, configuring proper DRX parameters is a very useful mechanism for saving the battery power consumption of a UE. Using the DRX applicable for lower real time, e.g. long cycle DRX can efficiently decrease the UE power consumption, e.g. when the DRX cycle is 640 ms long, the UE power consumption can reach the level of the power consumption in idle mode. Through selecting proper DRX parameters, e.g. the parameters of DRX cycle, ON time, inactivity timer length etc., the existing DRX mechanism can efficiently save UE power consumption. Thus, the key issue is to how selecting proper DRX parameters.
In the previous meetings, some proposals used for configuring DRX parameters are proposed. The industry opinion is that for the UE only with background traffic, the power in connection state should be similar with the one in idle state. Thus, the UE only with background traffic should configure long DRX. But in existing standards, the eNB can't determine whether a UE only has background traffic. In the standardization proposals, the proposal R2-121465 proposes that: the eNB provides a series of DRX parameters to a UE. Since the UE knows most what traffic is running, how is its data packets arrival distribution, and other cross layer information, the UE can select the most suitable DRX parameters from the series of DRX parameters, and inform the eNB of an index of the selected parameter. The eNB takes the UE selection into account and combines related factors (e.g. network load etc.), and configures final DRX parameters (selected by the UE, or changed by the eNB) for the UE.
In addition, the battery status information of a UE can also be provided to an eNB, so that the eNB determines DRX parameters configuration. E.g. if the UE has enough battery, the eNB may configure DRX parameters suitable for a higher real time characteristic, while if the UE has limited battery, the eNB performs optimization to DRX parameters, e.g. configuring DRX parameters suitable for a lower real time characteristic to save battery and make the standby time of a UE longer. R2-121465 proposed using battery level, and LG Electronics proposed that using power connection indication to report battery information, but they can't reflect the battery condition of a user.
Summary of the Invention
Within the existing technology, the eNB can't determine whether a UE only has background traffic, and the eNB doesn't support different DRX parameters configuration for the scenarios of with only background traffic, and with background traffic and other traffic. The solution in current standardization proposals must be that: at the UE side, the most suitable DRX parameters are selected according to collected information. And the UE also needs to take a long time to monitor traffic situation and obtain statistical results of arrival distribution of data packets etc., and only after that the UE is enabled to select suitable DRX parameters according to these statistical results. Thus, one disadvantage of standardization proposals is that the UE needs to implement more complex operation, and it is also very time consuming.
According to the first aspect of the invention, a method is provided, in a base station, used for configuring discontinuous reception parameters of a UE, comprising the following steps: receiving an indication transmitted by the UE, the indication indicating that the UE only has first type traffic; determining the discontinuous reception parameters matched with the first type traffic; transmitting to the UE the discontinuous reception parameters matched with the first type traffic. The UE may perform communications based on the discontinuous reception parameters, and determine the corresponding communication performance, and based on the communication performance, the UE may determine whether it is needed to adjust the discontinuous reception parameters, and transmit to the base station an indication of needing to adjust the parameters.
The advantage of this aspect is that, since the UE knows that only the first type traffic is running currently, the base station can determine DRX parameters matched with the first type traffic according to a report of a UE, and the configured parameters are adjusted progressively by the UE observing its communication performance, without requiring the UE to define selection rules and make selections, thereby sparing the time needed for monitoring the traffic situation.
According to a preferred embodiment, the method further comprises the following steps: receiving an indication transmitted by the UE, the indication indicating that the UE has first type traffic and second type traffic; determining the discontinuous reception parameters matched with the first type traffic and the second type traffic; transmitting to the UE the discontinuous reception parameters matched with the first type traffic and the second type traffic.
The advantage of this aspect is that, since the UE knows that the first type traffic and the second type traffic are simultaneously running currently, the base station can determine the matched DRX parameters to meet the needs of the second type traffic according to the report of the UE.
According to a preferred embodiment, the discontinuous reception parameters matched with the first type traffic comprises at least two sets of parameters, from which the determining step determines one set of parameters according to a certain rule,
the method further comprises the following steps:
- receiving a signaling transmitted by the UE, the signaling used for requesting the base station to adjust the discontinuous reception parameters;
- determining a final discontinuous reception parameter from the at least two sets of parameters, based on the signaling and combined with related factors.
The advantage of the embodiment is that, the DRX parameters is adjusted according to the feedback signaling of the UE, so that it can conform to the actual communication performance of the UE, and thus is more accurate.
Or, the method further comprises the following steps:
- determining communication performance of the UE's communication based on the discontinuous reception;
- determining whether it is needed to adjust the discontinuous reception parameters, based on the communication performance and combined with related factors.
Wherein, preferably, the related factors comprise:
- QoS of data to be transported to the UE;
- downlink traffic situation;
- system situation. The advantage of this embodiment is that, the eNB may determine whether the DRX parameters are suitable for the UE according to the downlink communication performance at the base station, and implement corresponding adjustment, which is more accurate.
According to a further embodiment, the certain rule is any one of the following:
- selecting prior the discontinuous reception parameters suitable for a higher real time characteristic.
-selecting prior the discontinuous reception parameters suitable for a lower real time characteristic.
- selecting randomly.
The method further comprises the following steps before the receiving step:
- determining initial discontinuous reception parameters, based on at least any one of the following conditions:
QoS of data to be transported to the UE;
downlink traffic situation;
system situation;
- transmitting to the UE the initial discontinuous reception parameters.
Wherein, the initial DRX parameters determined by the base station are used for the traffic scenario of coexisting background traffic and active traffic.
According to a preferable embodiment, the first type traffic includes background traffic, and the second type traffic includes active traffic,
the discontinuous reception parameters matched with the background traffic are suitable for a lower real time characteristic, wherein the parameters have at least any one of the following characteristics:
- longer discontinuous reception cycle;
- shorter ON time;
- shorter inactivity timer;
the discontinuous reception parameters matched with the scenario, in which the background traffic and the active traffic coexist, are suitable for a higher real time characteristic, wherein the parameters have at least any one of the following characteristics:
- shorter discontinuous reception cycle;
- longer ON time;
- longer inactivity timer.
The embodiment provides better DRX parameters respectively for different traffic scenarios, maintains the real time characteristic of traffic and optimizes power consumption.
According to the second aspect of the invention, a method is provided, in a
UE, used for configuring discontinuous reception parameters, comprising the following steps: transmitting an indication to a base station, the indication indicating that the UE only has first type traffic; receiving and configuring the discontinuous reception parameters, transmitted by the base station, matched with the first type traffic.
According to a preferred embodiment, the method further comprises the following steps: transmitting an indication to the base station, the indication indicating that the UE has first type traffic and second type traffic; receiving and configuring the discontinuous reception parameters, transmitted by the base station, matched with the first type traffic and the second type traffic.
According to a preferred embodiment, the method further comprises the following steps: communicating based on the discontinuous reception parameters, and determining corresponding communication performance; based on the communication performance, determining whether it is needed to adjust the discontinuous reception parameters; when it is needed, transmitting a signaling to the base station, the signaling used for requesting to adjust the discontinuous reception parameters.
Preferably, operations of said determining the communication performance comprise at least any one of: - checking a data amount of data to be transmitted in a buffer;
- checking a delay of data to be transmitted;
operations of said determining whether it is needed to adjust comprise:
- determining it is needed to adjust discontinuous reception to suit higher real time characteristic, when the data amount and/or the delay is greater than a certain threshold;
- determining it is needed to adjust discontinuous reception to suit lower real time characteristic, when the data amount and/or the delay is less than a certain threshold.
The advantage of the embodiment is that, the UE can determine whether it is needed to adjust DRX parameters according to the communication performance on the basis of the current DRX parameters, thereby making the DRX parameters meet the actual condition of the UE. Additionally, the communication performance can be measured by the UE easily, thus it would not excessively increase the complexity of the UE.
According to a preferred embodiment, the method further comprises the following steps before the transmitting step:
- receiving initial discontinuous reception parameters from the base station;
- determining whether or not the UE has the second type traffic except for the first type traffic:
• when having, using the initial discontinuous reception parameters to communicate;
• otherwise, sending the indication to the base station.
The advantage of the embodiment is that, since DRX parameters are determined by a base station, the DRX parameters determined by the base station by default are for the traffic scenario of the mixed first type traffic and second type traffic. When satisfying the scenario, the UE may use the parameters directly and spare the report process.
Another disadvantage of the existing technology is that only the characteristics of the battery currently used can be reflected, while the power consumption preference of the user can not. E.g. a user has a spare battery, and he needs communication performance of a higher real time characteristic, while none of the current UE and eNB can obtain this condition and do the corresponding processing.
In order to solve the problem, the invention further provides a method used for configuring discontinuous reception parameters in a base station, the method comprises the following steps: receiving from the UE a power consumption preference of a user; determining the discontinuous reception parameters of the UE, according to the power consumption preference; sending the discontinuous reception parameters to the UE.
The invention further provides a method, in a UE, used for configuring discontinuous reception parameters, comprising the following steps: receiving a power consumption preference input by a user; receiving the discontinuous reception parameters from a base station;
and further comprising the following step: sending the power consumption preference to the base station;
or further comprising the following steps: communicating based on the discontinuous reception parameters transmitted by the base station, and determining corresponding communication performance; determining whether it is needed to request the base station to adjust the discontinuous reception parameters, based on the power consumption preference and the communication performance.
The advantages of above aspects are that, a base station and UE can configure more suitable DRX parameters according to the power consumption preference of a user, thus improving the flexibility of communication system.
Brief description of the drawings By reading the detailed description of non-limiting embodiments referring to the following drawings, other features, purposes and advantages of the invention will become clearer:
Fig.l shows the diagram of waiting delay in various traffic scenarios according to an embodiment of the invention.
Fig.2 shows the diagram of waiting delay in various traffic scenarios according to another embodiment of the invention.
Detailed description of embodiments First, when the eNB determines that a UE needs to implement DRX, the eNB determines initial discontinuous reception parameters based on at least any one of the following conditions:
QoS of data to be transported to the UE;
downlink traffic situation;
system situation, e.g. load.
The eNB doesn't know the traffic situation of a UE, thus in general, the DRX parameters determined by the eNB are configured based on the QoS requirement of radio bearer to which the traffic maps, and these parameters are used in the traffic scenarios of coexisting background traffic and active traffic.
Then, the eNB sends the initial discontinuous reception parameters to the
UE.
The UE knows the traffic running on it, when the UE currently runs background traffic and active traffic at the same time, since the DRX parameters determined by the eNB are suitable for the traffic scenario of the UE, the UE directly uses the initial discontinuous reception parameters to communicate; and when the UE only runs background traffic, the DRX parameters may be unmatched with background traffic, e.g. the DRX is suitable for a higher real time characteristic, there will be a certain waste of power when the DRX is used for background traffic of a lower real time characteristic. Thus the UE sends an indication to the eNB, the indication indicates that the UE only has background traffic. In the aspect of specific implementation, the indication may be transported by MAC signaling.
The eNB receives the indication, and determines the DRX parameters matched with the first type traffic, then, the eNB provides the DRX parameters to the UE.
After receiving the DRX parameters, the UE configures the parameters to finish the setup process.
Then, the UE communicates based on the DRX parameters.
As shown in fig. 1, in the first hour (0-lhOm), the UE only has background traffic, thus the DRX cycle in the DRX parameters (para. 1) selected by the eNB for the UE is 1024ms, and the delay is shown as fig. 1.
Later, in the second hour (Ih0m-2h0m), except for the background traffic already running, the UE further starts an active traffic. Both of the two traffics may be mapped to the same or different radio bearer (RB). Whatever, the RB to which the active traffic maps requests a higher real time characteristic, and needs a shorter delay.
The UE sends the eNB an indication, the indication indicates that the UE has background traffic and active traffic, and the eNB receives the indication.
Then, the eNB determines the DRX parameters matched with the background traffic and active traffic, and sends the DRX parameters to the UE, the UE receives and configures the DRX parameters.
Later, the UE communicates based on the DRX parameters.
As shown in fig. 1, in the second hour, the UE has background traffic and active traffic, thus the DRX cycle in the DRX parameters (para. 2) which the eNB selects for the UE is 32ms, so as to ensure the requirement of a real time characteristic for the active traffic, and the delay is as shown in fig. 1. Later, in the third hour (2h0m-3h0m), the active traffic finishes, and the UE only has background traffic again.
The UE sends the eNB an indication, the indication indicates the UE only has background traffic, the eNB receives the indication.
Then, the eNB determines the DRX parameters matched with the background traffic, and sends the DRX parameters to the UE. The UE receives and configures the DRX parameters.
Later, the UE communicates based on the DRX parameters.
As shown in fig. 1, in the third hour (2h0m-3h0m), the UE only has background traffic, thus the DRX cycle in the DRX parameters which the eNB selects for the UE is 1024ms, to ensure the requirement of a real time characteristic for the active traffic, and the delay is shown in fig. 1.
Later, in the fourth hour (3h0m-4h0m) and the fifth hour (4h0m-4h30m), the UE respectively starts again and terminates an active traffic. The eNB configures for the UE respectively the DRX cycle of 32ms and the DRX cycle of 1024ms, and the delays are shown in fig. 1.
In the above embodiments, the DRX parameters configured by the eNB for the traffic scenario with only background traffic are the same. In a preferred embodiment, the eNB can select one from at least two sets of DRX parameters for the traffic scenario with only background traffic, and configure the selected parameters. The following will describe the embodiment.
Similar with the previous embodiment, the eNB does not know the traffic condition of a UE, thus, in general, the DRX parameters determined by the eNB are used in the traffic scenario of coexisting background traffic and active traffic.
Later, the eNB sends the initial discontinuous reception parameters to the
UE.
When the UE only runs background traffic 1 currently, the DRX parameters should be unmatched with background traffic, e.g. the DRX is suitable for a higher real time characteristic, and there is a certain waste of power when this DRX parameter is used for background traffic 1 of lower real time characteristic. Thus the UE sends an indication to the eNB, the indication indicates that the UE only has background traffic. In an aspect of specific implementation, the indication may be transported by MAC signaling.
The eNB receives the indication, and determines, from multiple DRX parameters, the DRX parameters matched with the background traffic. As described in more details below, the UE can feed back according to the communication performance on the basis of this determined DRX parameters, and finally determines the final DRX parameters. Thus, when determining this DRX parameters, the eNB can determine from the candidate sets of DRX parameters suitable for background traffic according to their properness to high or low real time characteristic, e.g. in order to ensure background traffic obtains shorter delay, the eNB prefers to select the DRX parameters suitable for a higher real time characteristic; in another example, in order to make the UE to save power, the eNB prefers to select the DRX parameters suitable for a lower real time characteristic; or, the eNB may select randomly. After that, the eNB provides this DRX parameters to the UE.
After receiving this DRX parameters, the UE configures this DRX parameters, and finishes the configuring process.
Then, the UE communicates based on this DRX parameters.
E.g. in order to save power for a UE, the eNB selects a DRX parameter suitable for a lower real time characteristic in the candidate sets of DRX parameters suitable for background traffic. The DRX parameter configured by the eNB for a UE in a priority is parameter 1 (para. 1), and the DRX cycle in the parameter is 1024ms. The UE communicates based on this DRX parameter, which is shown in a short time in the beginning of the first hour (OhOm-lhOm), and the maximum delay is 1024ms.
And, the UE further observes the communication performance of the UE's communication based on the DRX parameter. In some preferred embodiments, the UE can check a data amount of data to be transmitted in a buffer, and/or check a delay of data to be transmitted.
Later, based on communication performance, the UE determines whether or not it is needed to adjust the discontinuous reception parameters. In some preferred embodiments, the UE can:
- determining it is needed to adjust DRX to suit higher real time, when the data amount and/or the delay is greater than a certain threshold; or otherwise,
- determining it is needed to adjust DRX to suit lower real time, when the data amount and/or the delay is less than a certain threshold.
In the embodiment, the background traffic 1 has a larger data amount of data and is more frequent. In the case that the DRX cycle is 1024ms, it will leads to that the data amount in a buffer is excessive and the data delay is longer. Thus, the UE determines that it's needed to adjust DRX to suit a higher real time characteristic.
Next, the UE transmits a signaling to the eNB, the signaling is used for requesting to adjust the discontinuous reception parameters to suit higher real time characteristic. From the view of specific implementation, the signaling can be transported via a MAC signaling.
After the eNB receives the signaling, it can combine this signaling with related factors to determine the final discontinuous reception parameters of the UE. E.g. in the embodiment, the eNB can configure a DRX parameter 2 (para. 2) to the UE, and the DRX cycle is shortened from 1024ms to 640ms, which is shown in a period of time at the end of the first hour.
In the second hour (Ih0m-2h0m), the UE further starts active traffic. Then similar with the previous embodiment, the UE sends an indication to the eNB, the indication indicates the UE has background traffic and active traffic. Thus the eNB configures the DRX parameter 3 (para. 3) for the UE, wherein the DRX cycle is 32ms, to meet the requirement of a real time characteristic for the active traffic. The delay is shown in the second hour in fig. 2. In the third hour (2h0m-3h0m), the UE terminates the active traffic and background traffic 1, and starts background traffic 2.
The UE sends an indication to the eNB, and the indication indicates the UE only has background traffic. The eNB receives the indication.
Later, the eNB determines the DRX parameters matched with the background traffic. In an embodiment, similar with the first hour, in order to save power for a UE, the eNB selects a DRX parameter suitable for a lower real time characteristic in the candidate sets of DRX parameters suitable for background traffic, i.e. the DRX parameter configured for a UE is parameter 1. The UE communicates based on the DRX parameter 1.
The UE further determines the communication performance of the UE's communication on the basis of the DRX parameter 1. The UE can check a data amount of data to be transmitted in a buffer, and/or check a delay of data to be transmitted.
In the embodiment, the background traffic 2 has a less data amount of data and is less frequent. In the case that the DRX cycle is 1024ms, the data amount in a buffer and the data delay are all proper. Thus, the UE determines that it's not needed to adjust DRX parameter.
In another embodiment, since previously, the DRX parameter finally configured by the eNB for the UE with only having background traffic is parameter 2, the eNB may record the parameter. In the third hour, this DRX parameter 2 is configured for the UE.
The UE communicates based on the DRX parameter 2, which is shown as a short time in the beginning of the third hour.
And, the UE further determines the communication performance of the UE's communication on the basis of the DRX parameter. The UE can check a data amount of data to be transmitted in a buffer, and/or check a delay of data to be transmitted.
In the embodiment, the background traffic 2 has a less data amount of data and is less frequent. In the case that the DRX cycle is 640ms, the data amount in a buffer is less and the data delay is shorter. Thus, due to the reason of saving power etc., the UE can determine that it's needed to adjust DRX to suit the lower real time characteristic.
Next, the UE transmits a signaling to the eNB, the signaling is used for requesting to adjust the discontinuous reception parameters to suit lower real time characteristic. From the view of specific realization, the signaling can be transported via a MAC signaling.
After the eNB receives the signaling, it can combine this signaling with related factors to determine the final discontinuous reception parameters of the UE. E.g. in the embodiment, the eNB can configure DRX parameter 1 to the UE, namely the DRX cycle is lengthened from 640ms to 1024ms, which is shown in a period of time at the end of the third hour. The maximum delay is 1024ms.
Later, in the fourth hour (3h0m-4h0m) and the fifth hour (4h0m-4h30m, the UE respectively starts active traffic again, and terminates the active traffic. The eNB configures for the UE the DRX cycle of 32ms and the DRX cycle of 1024ms respectively, and the delay is shown in fig. 2.
In the above embodiment, the UE requests to adjust DRX parameters according to communication performance. In a varied embodiment, the eNB may automatically adjust DRX according to communication performance, e.g. the eNB can determine whether or not the buffered data amount or delay of downlink data of the UE is oversized or undersized, and adjust DRX parameters to make them suit higher or lower real time characteristic according to the performance.
In another aspect, in existing technology, the battery level and charge status exchanged by the UE and the eNB can't reflect the actual preference of a user. E.g. the user with high power UE needs to save as much power as possible, since he can not replace or charge his battery in a period time; or the user with low power UE does not need to save power, but needs shorter delay, since he has a spare battery or he can charge his battery. In order to solve the problem, in the embodiment of the invention, the UE receives a power consumption preference inputted by a user, and sends the power consumption preference to the eNB. The eNB can determine the discontinuous reception parameters of the UE, according to the power consumption preference, and send the discontinuous reception parameters to the UE. E.g. when the power preference is saving power, the eNB can determine to use the DRX parameters of longer DRX cycle; while when the power preference needn't to save power, the eNB can determine to use the DRX parameters of shorter DRX cycle.
Or, the UE communicates based on the discontinuous reception parameters transmitted by the base station, and determines corresponding communication performance. The UE receives the power consumption preference inputted by a user, and determines whether it is needed to request the base station to adjust the discontinuous reception parameters, based on the power consumption preference and the communication performance. E.g. when the delay is too high, and the power preference needn't save power, the UE can send an adjusting signaling; while when the power preference needs to save power, the UE doesn't send the signaling.
It needs to explain that, in the case of non-conflict, the embodiments in the application and the features in the embodiments may combine with each other randomly.
Certainly, there are other multiple embodiments in the invention, without departing from the spirit and essence of the invention, the technicians familiar with the field may make all kinds of corresponding changes and deformations according to the invention, while the corresponding changes and deformations should belong to the protect range of the claims attached by the invention. E.g. several sets of DRX parameters suitable for background traffic further comprise different ON time and inactivity timers. The ordinary technicians in the field may understand all or partial steps in the above methods through programs commanding related hardware to achieve, the programs may be stored in readable storage medium of a computer, e.g. a read-only memory, disk or CD-ROM etc. Optionally, all or partial steps in the above embodiments may use one or multiple integrated circuits to achieve. Correspondingly, each module/unit in the above embodiments may take the hardware form to realize, either take the form of software function module to achieve. The invention isn't limited to any specific forms of combination of hardware and software.

Claims

What is claimed is:
1. A method, in a base station, used for configuring discontinuous reception mode parameters of a UE, comprising the following steps:
- receiving an indication transmitted by the UE, the indication indicating that the UE only has first type traffic;
- determining the discontinuous reception parameters matched with the first type traffic;
- transmitting to the UE the discontinuous reception parameters matched with the first type traffic.
2. A method of claim 1, further comprising the following steps:
- receiving an indication transmitted by the UE, the indication indicating that the UE has the first type traffic and second type traffic;
- determining the discontinuous reception parameters matched with the first type traffic and the second type traffic;
- transmitting to the UE the discontinuous reception parameters matched with the first type traffic and the second type traffic.
3. A method of claim 1, wherein the discontinuous reception parameters matched with the first type traffic comprises at least two sets of parameters, from which the determining step determines one set of parameters according to a certain rule,
the method further comprises the following steps:
- receiving a signaling transmitted by the UE, the signaling used for requesting the base station to adjust the discontinuous reception parameters;
- determining a final discontinuous reception parameter from the at least two sets of parameters, based on the signaling together with related factors; or, the method further comprises the following steps:
- determining communication performance of the UE's communication based on the discontinuous reception;
- determining whether it is needed to adjust the discontinuous reception parameters, based on the communication performance together with related factors.
4. A method of claim 1, further comprising the following steps before the receiving step:
- determining initial discontinuous reception parameters, based on at least any one of the following conditions:
QoS of data to be transported to the UE;
downlink traffic situation;
system situation;
- transmitting to the UE the initial discontinuous reception parameters.
5. A method of claim 1, further comprising the following steps:
- receiving from the UE a power consumption preference of a user;
- determining the discontinuous reception parameters of the UE, according to the power consumption preference.
6. A method of claim 2, wherein the first type traffic includes background traffic, and the second type traffic includes active traffic,
the discontinuous reception parameters matched with the background traffic are suitable for a lower real time characteristic, wherein the parameters have at least any one of the following characteristics:
- longer discontinuous reception cycle;
- shorter ON time;
- shorter inactivity timer;
the discontinuous reception parameters matched with a scenario, in which the background traffic and the active traffic coexist, are suitable for a higher real time characteristic, wherein the parameters have at least any one of the following characteristics:
- shorter discontinuous reception cycle;
- longer ON time;
- longer inactivity timer.
7. A method, in a UE, used for configuring discontinuous reception parameters, comprising the following steps:
- transmitting an indication to a base station, the indication indicating that the UE only has first type traffic;
- receiving and configuring the discontinuous reception parameters, transmitted by the base station, matched with the first type traffic.
8. A method of claim 7, further comprising the following steps:
- transmitting an indication to the base station, the indication indicating that the UE has the first type traffic and second type traffic;
- receiving and configuring the discontinuous reception parameters, transmitted by the base station, matched with the first type traffic and the second type traffic.
9. A method of claim 7, further comprising the following steps:
- communicating based on the discontinuous reception parameters, and determining corresponding communication performance;
- based on the communication performance, determining whether it is needed to adjust the discontinuous reception parameters;
- when it is needed, transmitting a signaling to the base station, the signaling used for requesting to adjust the discontinuous reception parameters.
10. A method of claim 9, wherein operations of said determining the communication performance comprises at least any one of:
- checking a data amount of data to be transmitted in a buffer;
- checking a delay of data to be transmitted;
operations of said determining whether it is needed to adjust comprise:
- determining it is needed to adjust discontinuous reception to suit higher real time characteristic, when the data amount and/or the delay is greater than a certain threshold;
- determining it is needed to adjust discontinuous reception to suit lower real time characteristic, when the data amount and/or the delay is less than a certain threshold.
11. A method of claim 7, further comprising the following steps before the transmitting step:
- receiving initial discontinuous reception parameters from the base station;
- determining whether or not the UE has the second type traffic except the first type traffic:
• when having, using the initial discontinuous reception parameters to communicate;
· otherwise, sending the indication to the base station.
12. A method of claim 8 or 11, wherein the first type traffic includes background traffic, and the second type traffic includes active traffic.
13. A method of claim 9, further comprising the following steps:
- receiving a power consumption preference input by a user;
the step of determining whether it is it is needed to adjust the discontinuous reception parameters are further based on the power consumption preference; and the method further comprises the step:
- sending the power consumption preference to the base station.
14. A method, in a base station, used for configuring discontinuous reception parameters of a UE, comprising the following steps:
- receiving from the UE a power consumption preference of a user;
- determining the discontinuous reception parameters of the UE, according to the power consumption preference.
- sending the discontinuous reception parameters to the UE.
15. A method, in a UE, used for configuring discontinuous reception parameters, comprising the following steps:
- receiving a power consumption preference input by a user;
- receiving the discontinuous reception parameters from a base station; and further comprising the following step: - sending the power consumption preference to the base station;
or further comprising the following steps:
- communicating based on the discontinuous reception parameters transmitted by the base station, and determining corresponding communication performance;
- determining whether it is needed to request the base station to adjust the discontinuous reception parameters, based on the power consumption preference and the communication performance.
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