WO2012020311A2 - Method and apparatus for managing multimedia broadcast multicast service mbms transmission - Google Patents

Method and apparatus for managing multimedia broadcast multicast service mbms transmission Download PDF

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Publication number
WO2012020311A2
WO2012020311A2 PCT/IB2011/002070 IB2011002070W WO2012020311A2 WO 2012020311 A2 WO2012020311 A2 WO 2012020311A2 IB 2011002070 W IB2011002070 W IB 2011002070W WO 2012020311 A2 WO2012020311 A2 WO 2012020311A2
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Prior art keywords
base station
mbms
transmission
mbms transmission
switching
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PCT/IB2011/002070
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French (fr)
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WO2012020311A3 (en
Inventor
Yu Chen
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Alcatel Lucent
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Publication date
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Publication of WO2012020311A2 publication Critical patent/WO2012020311A2/en
Publication of WO2012020311A3 publication Critical patent/WO2012020311A3/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services

Definitions

  • the present invention relates to the communication field, and more specifically, to a method and apparatus for managing multimedia broadcast multicast service MBMS.
  • MBS FN multicast broadcast single-frequency network
  • eNBs base stations
  • CP extended cyclic prefix
  • the inter-station distance ISD needs to be small. And this is very necessary for unicast.
  • 3GPP a 500m-inter-stattion distance ISD scenario is defined.
  • the inventor also studies a 250m-inter-station distance ISD scenario. According to the finds, the cell edge SINR is around 25dB for MBMS transmission for 2G carrier in a 500m-inter-station distance scenario, and could be as high as 32dB for MBMS transmission for 2G carrier in a 250m-inter-station distance scenario. And the cell edge SINR could be even higher for MBMS transmission for 900MHz whatever the inter-station distance is 500 meters or 250 meters.
  • a method of managing multimedia broadcast multicast service MBMS transmission wherein a plurality of base stations simultaneously transmit MBMS via a single frequency, the method comprising the step of: switching off MBMS transmission of at least one base station among the plurality of base stations.
  • an apparatus for managing multimedia broadcast multicast service MBMS transmission wherein a plurality of base stations simultaneously transmit MBMS via a single frequency, the apparatus comprising switching off means for switching off MBMS transmission of at least one base station among the plurality of base stations.
  • the system power can be saved.
  • FIG. 1 schematically illustrates the basic principle of the present invention.
  • FIG. 2 schematically illustrates an apparatus 200 for managing MBMS transmission according to an embodiment of the present invention, wherein a plurality of base stations simultaneously transmit MBMS signals via a single frequency.
  • Like numerals represent the same, similar or corresponding features or functions throughout the figures.
  • the core idea of the present invention is to achieve the object of saving the power by managing MBMS transmission. More particularly, the object is achieved by switching off MBMS transmission of at least one base station among a plurality of base stations that simultaneously transmit MBMS via a single frequency. This is applicable.
  • MBMS is transmitted by SFN (single-frequency network) technique, so when MBMS of at least one base station is switched off, MBMS of those remaining base stations can cover the space that was originally covered by the switched-off at least one base station.
  • SFN single-frequency network
  • FIG. 1 schematically illustrates the basic principle of the present invention.
  • Background 100 comprises a plurality of base stations. Before using the present invention, it is supposed that all these base stations simultaneously transmit MBMS via a single frequency.
  • MBMS transmission of the at least one base station is switched off according to the number of user terminals that receive MBMS under each base station of the plurality of base stations.
  • each base station reports the number of user terminals that receive MBMS, to a control device such as MCE (MBMS coordination entity); according to the information, the control device selects the at least one base station whose MBMS transmission is to be switched off, and sends instruction to it. The at least one base station receives the instruction and then switches off its MBMS transmission.
  • MCE MBMS coordination entity
  • the control device may switch off MBMS transmission of the at least one base station that has a less number of user terminals that receive MBMS than a certain threshold. According to this criterion, it is possible to minimize the effect caused by the switch off MBMS transmission of base stations.
  • MBMS transmission of the at least one base station is switched off according to the power consumption of corresponding unicast service at each base station of the plurality of base stations.
  • each base station reports the power consumption of corresponding unicast service to a control device such as MCE; according to the information, the control device selects the at least one base station whose MBMS transmission is to be switched off.
  • control device may switch off MBMS transmission of the at least one base station whose power consumption of corresponding unicast service is relatively large. According to this criterion, it is possible to minimize the system power consumption.
  • network topology may be used to select at least one base station whose MBMS transmission is to be switched off. More particularly, the inter-station distance of each base station transmitting MBMS can be enlarged.
  • MBMS transmission of the at least one base station after MBMS transmission of the at least one base station is switched off, it may be re-initiated while MBMS transmission of at least one other base station among the plurality of base stations is switched off.
  • this base station whose MBMS transmission was not originally switched off may be selected to switch off its MBMS transmission.
  • this base station whose MBMS transmission was originally switched off may be selected to re-initiate its MBMS transmission.
  • switching off MBMS transmission of at least one base station comprises: switching off transmission of user plane data of MBMS of the at least one base station, while maintaining transmission of control plane data of MBMS of the at least one base station.
  • control plane More particularly, for control plane:
  • All base stations including the at least one base station whose MBMS transmission is switched off, still have their M2 interfaces(interface between a base station and MCE) and receive the signaling from MCE.
  • All base stations including the at least one base station whose MBMS transmission is switched off, still transmit the notification signaling on PDCCH (physical dedicated control channel).
  • PDCCH physical dedicated control channel
  • All base stations including the at least one base station whose MBMS transmission is switched off, still broadcast the SIB (system information block) 13 signaling on DL-SCH (downlink shared channel) (including the channel it actually will not transmit).
  • SIB system information block
  • the at least one base station whose MBMS transmission is switched off switch off the transmission of user plane data.
  • the at least one base station whose MBMS transmission is switched off may switch off its Ml interface.
  • the at least one base station whose MBMS transmission is switched off may refuse to establish a corresponding Ml bearer.
  • the plurality of base stations respectively transmit MBMS and unicast service over a single carrier in time-division multiplexing fashion.
  • the at least one base station whose MBMS transmission is switched off goes into discontinuous transmission mode (because transmission of unicast service is still continued and not switched off).
  • Fig. 2 schematically illustrates an apparatus 200 for managing MBMS transmission according to an embodiment of the present invention, wherein a plurality of base stations simultaneously transmit MBMS via a single frequency.
  • the apparatus is MCE, for example.
  • the apparatus 200 comprises switching off means 210 for switching off MBMS transmission of at least one base station among the plurality of base stations.
  • the switching off means switches off MBMS transmission of the at least one base station according to the number of user terminals that receive MBMS under each of the plurality of base stations.
  • the switching off means switches off MBMS transmission of the at least one base station according to the power consumption of corresponding unicast service at each base station of the plurality of base stations.
  • the apparatus 200 further comprises re-initiating means 220 for re-initiating MBMS transmission of the at least one base station, and the switching off means 210 is further for switching off MBMS transmission of at least one other base station of the plurality of base stations.
  • switching off MBMS transmission of at least one base station comprises: switching off transmission of user plane data of MBMS of the at least one base station, while maintaining transmission of control plane data of MBMS of the at least one base station.
  • All base stations including the at least one base station whose MBMS transmission is switched off, still have their M2 interfaces (interface between a base station and MCE) and receive the signaling from MCE.
  • All base stations including the at least one base station whose MBMS transmission is switched off, still transmit the notification signaling on PDCCH (physical dedicated control channel).
  • PDCCH physical dedicated control channel
  • All base stations including the at least one base station whose MBMS transmission is switched off, still broadcast the SIB (system information block) 13 signaling on DL-SCH (downlink shared channel) (including the channel it actually will not transmit).
  • SIB system information block
  • the at least one base station whose MBMS transmission is switched off switches off the transmission of user plane data.
  • the at least one base station whose MBMS transmission is switched off may switch off the Ml interface.
  • the at least one base station whose MBMS transmission is switched off may refuse to establish a corresponding Ml bearer.
  • the plurality of base stations respectively transmit MBMS and unicast service over a single carrier in time-division multiplexing fashion.
  • program storage means which is machine or computer readable and encoded with a machine-executable or computer-executable instruction program, wherein the instructions execute some or all steps of the above method.
  • the program storage means may be, for example, magnetic storage media like a magnetic disk and a magnetic tape, a hard disc driver, or optical readable digital data storage media.
  • Embodiments are also intended to encompass a computer that is programmed to execute all steps of the above method.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present invention discloses a method and apparatus for managing multimedia broadcast multicast service MBMS transmission, wherein a plurality of base stations simultaneously transmit MBMS via a single frequency. The method comprises the step of: switching off MBMS transmission of at least one base station among the plurality of base stations. According to the present invention, the system power can be saved.

Description

METHOD AND APPARATUS FOR MANAGING MULTIMEDIA BROADCAST MULTICAST SERVICE MBMS TRANSMISSION
TECHNICAL FIELD
[0001] The present invention relates to the communication field, and more specifically, to a method and apparatus for managing multimedia broadcast multicast service MBMS.
DESCRIPTION OF THE RELATED ART
[0002] According to related 3 GPP standards, MBS FN (multicast broadcast single-frequency network) technology is employed to transmit MBMS, where all involved base stations (eNBs) transmit MBMS signals at the same frequency, so multi-cell signals are naturally combined in the air. The interference from neighbor cells only occur when the signal travels a long distance, e.g., longer than 5km to exceed the extended cyclic prefix (CP) length of MBMS. Since the signal strength is much decreased after such a long travel, for the deployment of a small inter-station distance ISD, the interference from other cells could be almost neglected at the edge of one cell. The consequence is the cell edge SINR (signal to interference plus noise ratio) is very high.
[0003] To achieve a higher system capacity, the inter-station distance ISD needs to be small. And this is very necessary for unicast. In 3GPP, a 500m-inter-stattion distance ISD scenario is defined. The inventor also studies a 250m-inter-station distance ISD scenario. According to the finds, the cell edge SINR is around 25dB for MBMS transmission for 2G carrier in a 500m-inter-station distance scenario, and could be as high as 32dB for MBMS transmission for 2G carrier in a 250m-inter-station distance scenario. And the cell edge SINR could be even higher for MBMS transmission for 900MHz whatever the inter-station distance is 500 meters or 250 meters.
[0004] However, on the other hand, for MBMS transmission, the maximum cell edge SINR needed when 64QAM 4/5 (which is the highest modulation and coding scheme) is employed is only 16dB. Hence, most of the power is wasted for MBMS transmission, and lOdB SINR power difference means 90% power waste.
[0005] Therefore, there is a need for a solution capable of saving the power.
SUMMARY OF THE INVENTION
[0006] According to a first aspect of the present invention, there is proposed a method of managing multimedia broadcast multicast service MBMS transmission, wherein a plurality of base stations simultaneously transmit MBMS via a single frequency, the method comprising the step of: switching off MBMS transmission of at least one base station among the plurality of base stations.
[0007] According to a second aspect of the present invention, there is proposed an apparatus for managing multimedia broadcast multicast service MBMS transmission, wherein a plurality of base stations simultaneously transmit MBMS via a single frequency, the apparatus comprising switching off means for switching off MBMS transmission of at least one base station among the plurality of base stations.
[0008] According to the present invention, the system power can be saved.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009] As the present invention is apprehended more thoroughly, other objects and effects of the present invention will become more apparent and easier to understand from the following description with reference to the accompanying drawings, wherein:
[00010] Fig. 1 schematically illustrates the basic principle of the present invention; and
[00011] Fig. 2 schematically illustrates an apparatus 200 for managing MBMS transmission according to an embodiment of the present invention, wherein a plurality of base stations simultaneously transmit MBMS signals via a single frequency. [00012] Like numerals represent the same, similar or corresponding features or functions throughout the figures.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0013] Hereinafter, the embodiments of the present invention will be detailed described with reference to the figures.
[0014] The core idea of the present invention is to achieve the object of saving the power by managing MBMS transmission. More particularly, the object is achieved by switching off MBMS transmission of at least one base station among a plurality of base stations that simultaneously transmit MBMS via a single frequency. This is applicable. MBMS is transmitted by SFN (single-frequency network) technique, so when MBMS of at least one base station is switched off, MBMS of those remaining base stations can cover the space that was originally covered by the switched-off at least one base station. Hence, virtually, MBMS of one base station serves a larger area, which is equivalent to a large MBMS cell.
[0015] Fig. 1 schematically illustrates the basic principle of the present invention.
[0016] Background 100 comprises a plurality of base stations. Before using the present invention, it is supposed that all these base stations simultaneously transmit MBMS via a single frequency.
[0017] After using the present invention, only three of all base stations, namely base stations 110, 120, 130, still transmit MBMS at the same time via a single frequency.
[0018] According to an embodiment of the present invention, MBMS transmission of the at least one base station is switched off according to the number of user terminals that receive MBMS under each base station of the plurality of base stations.
[0019] More particularly, each base station reports the number of user terminals that receive MBMS, to a control device such as MCE (MBMS coordination entity); according to the information, the control device selects the at least one base station whose MBMS transmission is to be switched off, and sends instruction to it. The at least one base station receives the instruction and then switches off its MBMS transmission.
[0020] For example, the control device may switch off MBMS transmission of the at least one base station that has a less number of user terminals that receive MBMS than a certain threshold. According to this criterion, it is possible to minimize the effect caused by the switch off MBMS transmission of base stations.
[0021] According to another aspect of the present invention, MBMS transmission of the at least one base station is switched off according to the power consumption of corresponding unicast service at each base station of the plurality of base stations.
[0022] More particularly, each base station reports the power consumption of corresponding unicast service to a control device such as MCE; according to the information, the control device selects the at least one base station whose MBMS transmission is to be switched off.
[0023] For example, the control device may switch off MBMS transmission of the at least one base station whose power consumption of corresponding unicast service is relatively large. According to this criterion, it is possible to minimize the system power consumption.
[0024] Of course, those skilled in the art may further devise other criteria for selecting at least one base station whose MBMS transmission is to be switched off. For example, network topology may be used to select at least one base station whose MBMS transmission is to be switched off. More particularly, the inter-station distance of each base station transmitting MBMS can be enlarged.
[0025] According to an embodiment of the present invention, after MBMS transmission of the at least one base station is switched off, it may be re-initiated while MBMS transmission of at least one other base station among the plurality of base stations is switched off.
[0026] For example, as user terminals are moving, when the number of user terminals receiving MBMS under a base station is less than a threshold, this base station whose MBMS transmission was not originally switched off may be selected to switch off its MBMS transmission. Likewise, as user terminals are moving, when the number of user terminals receiving MBMS under a base station is more than a threshold, this base station whose MBMS transmission was originally switched off may be selected to re-initiate its MBMS transmission.
[0027] According to an embodiment of the present invention, switching off MBMS transmission of at least one base station comprises: switching off transmission of user plane data of MBMS of the at least one base station, while maintaining transmission of control plane data of MBMS of the at least one base station.
[0028] More particularly, for control plane:
[0029] All base stations, including the at least one base station whose MBMS transmission is switched off, still have their M2 interfaces(interface between a base station and MCE) and receive the signaling from MCE.
[0030] All base stations, including the at least one base station whose MBMS transmission is switched off, still transmit the notification signaling on PDCCH (physical dedicated control channel).
[0031] All base stations, including the at least one base station whose MBMS transmission is switched off, still broadcast the SIB (system information block) 13 signaling on DL-SCH (downlink shared channel) (including the channel it actually will not transmit).
[0032] For user plane:
[0033] Although all base stations have their Ml interfaces and Ml bearers with the MBMS GW (gateway), the at least one base station whose MBMS transmission is switched off switch off the transmission of user plane data.
[0034] Of course, the at least one base station whose MBMS transmission is switched off may switch off its Ml interface. In addition, when the Ml interface is not switched off, upon arrival of new traffic, the at least one base station whose MBMS transmission is switched off may refuse to establish a corresponding Ml bearer.
[0035] In an embodiment of the present invention, the plurality of base stations respectively transmit MBMS and unicast service over a single carrier in time-division multiplexing fashion.
[0036] Hence, in this embodiment, the at least one base station whose MBMS transmission is switched off goes into discontinuous transmission mode (because transmission of unicast service is still continued and not switched off).
[0037] Fig. 2 schematically illustrates an apparatus 200 for managing MBMS transmission according to an embodiment of the present invention, wherein a plurality of base stations simultaneously transmit MBMS via a single frequency. The apparatus is MCE, for example.
[0038] As illustrated in Fig. 2, the apparatus 200 comprises switching off means 210 for switching off MBMS transmission of at least one base station among the plurality of base stations.
[0039] In an embodiment of the present invention, the switching off means switches off MBMS transmission of the at least one base station according to the number of user terminals that receive MBMS under each of the plurality of base stations.
[0040] In another embodiment of the present invention, the switching off means switches off MBMS transmission of the at least one base station according to the power consumption of corresponding unicast service at each base station of the plurality of base stations.
[0041] In another embodiment of the present invention, the apparatus 200 further comprises re-initiating means 220 for re-initiating MBMS transmission of the at least one base station, and the switching off means 210 is further for switching off MBMS transmission of at least one other base station of the plurality of base stations.
[0042] In an embodiment of the present invention, switching off MBMS transmission of at least one base station comprises: switching off transmission of user plane data of MBMS of the at least one base station, while maintaining transmission of control plane data of MBMS of the at least one base station.
[0043] More particularly, for control plane: [0044] All base stations, including the at least one base station whose MBMS transmission is switched off, still have their M2 interfaces (interface between a base station and MCE) and receive the signaling from MCE.
[0045] All base stations, including the at least one base station whose MBMS transmission is switched off, still transmit the notification signaling on PDCCH (physical dedicated control channel).
[0046] All base stations, including the at least one base station whose MBMS transmission is switched off, still broadcast the SIB (system information block) 13 signaling on DL-SCH (downlink shared channel) (including the channel it actually will not transmit).
[0047] For user plane:
[0048] Although all base stations have their Ml interfaces and Ml bearers with the MBMS GW (gateway), the at least one base station whose MBMS transmission is switched off switches off the transmission of user plane data.
[0049] Of course, the at least one base station whose MBMS transmission is switched off may switch off the Ml interface. In addition, when the Ml interface is not switched off, upon arrival of new traffic, the at least one base station whose MBMS transmission is switched off may refuse to establish a corresponding Ml bearer.
[0050] In an embodiment of the present invention, the plurality of base stations respectively transmit MBMS and unicast service over a single carrier in time-division multiplexing fashion.
[0051] It should be noted that in order to facilitate easier understanding of the present invention, the foregoing description omits more detailed technical details that are well known to those skilled in the art and might be indispensable to the implementation of the present invention.
[0052] The specification of the present invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or to limit the invention to the form as disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art.
[0053] Therefore, the embodiments were chosen and described in order to best explain the principles of the invention and the practical application thereof, and to enable others of ordinary skill in the art to understand that all modifications and alterations made without departing from the spirit of the present invention fall into the protection scope of the present invention as defined in the appended claims.
[0054] Furthermore, those skilled in the art may appreciate that the various steps of the method described above may be implemented by a programmed computer. Here, some embodiments are intended to encompass program storage means, which is machine or computer readable and encoded with a machine-executable or computer-executable instruction program, wherein the instructions execute some or all steps of the above method. The program storage means may be, for example, magnetic storage media like a magnetic disk and a magnetic tape, a hard disc driver, or optical readable digital data storage media. Embodiments are also intended to encompass a computer that is programmed to execute all steps of the above method.

Claims

WHAT IS CLAIMED IS:
1. A method of managing multimedia broadcast multicast service MBMS transmission, wherein a plurality of base stations simultaneously transmit MBMS via a single frequency, the method comprising the step of: switching off MBMS transmission of at least one base station among the plurality of base stations.
2. The method according to Claim 1, wherein MBMS transmission of the at least one base station is switched off according to the number of user terminals that receive MBMS under each base station of the plurality of base stations.
3. The method according to Claim 1, wherein MBMS transmission of the at least one base station is switched off according to the power consumption of corresponding unicast service at each base station of the plurality of base stations.
4. The method according to Claim 1, further comprising the step of:
re-initiating MBMS transmission of the at least one base station, and switching off MBMS transmission of at least one other base station of the plurality of base stations.
5. The method according to Claim 1, wherein switching off MBMS transmission of at least one base station comprises:
switching off transmission of user plane data of MBMS of the at least one base station, while maintaining transmission of control plane data of MBMS of the at least one base station.
6. The method according to Claim 1, wherein the plurality of base stations respectively transmit MBMS and unicast service over a single carrier in time-division multiplexing fashion.
7. An apparatus for managing multimedia broadcast multicast service MBMS transmission, wherein a plurality of base stations simultaneously transmit MBMS via a single frequency, the apparatus comprising:
switching off means for switching off MBMS transmission of at least one base station among the plurality of base stations.
8. The apparatus according to Claim 7, wherein the switching off means switches off MBMS transmission of the at least one base station according to the number of user terminals that receive MBMS under each base station of the plurality of base stations.
9. The apparatus according to Claim 7, wherein the switching off means switches off MBMS transmission of the at least one base station according to the power consumption of corresponding unicast service at each base station of the plurality of base stations.
10. The apparatus according to Claim 7, further comprising:
re-initiating means for re-initiating MBMS transmission of the at least one base station, and wherein the switching off means is further for switching off MBMS transmission of at least one other base station of the plurality of base stations.
11. The apparatus according to Claim 7, wherein switching off MBMS transmission of at least one base station comprises:
switching off transmission of user plane data of MBMS of the at least one base station, while maintaining transmission of control plane data of MBMS of the at least one base station.
12. The apparatus according to Claim 7, wherein the plurality of base stations respectively transmit MBMS and unicast service over a single carrier in time-division multiplexing fashion.
PCT/IB2011/002070 2010-08-12 2011-07-29 Method and apparatus for managing multimedia broadcast multicast service mbms transmission WO2012020311A2 (en)

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