Source: http://www.google.de/patents/US7996008
Timestamp: 2013-05-26 03:30:32
Document Index: 527112211

Matched Legal Cases: ['Application No. 10171649', 'Application No. 10171651', 'Application No. 10171652', 'Application No. 10171656', 'Application No. 10171657', 'Application No. 10171655', 'Application No. 10171653', 'Application No. 10171654', 'Application No. 10']

Patent US7996008 - Mobile communication terminal and radio communication system - Google PatenteSuche Bilder Maps Play YouTube News Gmail Drive Mehr » Erweiterte Patentsuche | Webprotokoll | Anmelden Erweiterte Patentsuche PatenteA mobile communications terminal divides a plurality of multipath signals associated with radio signals transmitted from a plurality of base stations using an S-CCPCH into groups by base station, i.e., by transmit source, maximum-ratio-combines a plurality of multipath signals associated with each same...http://www.google.de/patents/US7996008?utm_source=gb-gplus-sharePatent US7996008 - Mobile communication terminal and radio communication system Ver�ffentlichungsnummerUS7996008 B2PublikationstypErteilung Anmeldenummer12/652,391 Ver�ffentlichungsdatum9. Aug. 2011Eingetragen5. Jan. 2010 Priorit�tsdatum30. M�rz 2004Auch ver�ffentlicht unterCN1902844AEP1699147A1EP1699147A4EP1699147B1EP1865629A2EP1865629A3EP1865629B1EP1865630A2EP1865630A3EP1865630B1EP1871018A2EP1871018A3EP1871018B1EP2088692A1EP2088692B1EP2088692B8EP2202896A1EP2202896B1EP2242190A1EP2242190B1EP2246997A1EP2246997B1EP2246998A1EP2246998B1EP2249489A1EP2249489B1US7680496US7773986US8229426US8364149US20080305790US20100105383US20100105387US20110261744US20110263287WO2005104402A1 ErfinderHideji WakabayashiUrspr�nglich Bevollm�chtigterSony Corporation US-Klassifikation455/434455/572455/436455/435.1Internationale KlassifikationH04W36/18H04B7/005H04W52/32H04W48/20H04W4/06H04W52/16H04B7/26H04W36/08H04W48/14H04W4/00H04B7/02H04W88/02 UnternehmensklassifikationH04W72/005H04W52/16H04W52/32H04W48/20H04W52/322H04B7/022H04W52/327H04W52/325H04B7/26 Europ�ische KlassifikationH04W52/32H04W48/20H04B7/02MH04B7/26H04W52/16ReferenzenPatentzitate (34)Nichtpatentzitate (12)Externe LinksUSPTO USPTO-Zuordnung EspacenetMobile communication terminal and radio communication systemUS 7996008 B2 Zusammenfassung A mobile communications terminal divides a plurality of multipath signals associated with radio signals transmitted from a plurality of base stations using an S-CCPCH into groups by base station, i.e., by transmit source, maximum-ratio-combines a plurality of multipath signals associated with each same base station which is a transmit source into a composite signal, decodes the composite signal, and selects a composite signal having a good decoded result from among decoded composite signals.
1. A mobile station which can receive a multimedia broadcast multicast service (MBMS) of multicasting or broadcasting a multimedia data to a plurality of mobile stations in a communications system, said mobile station comprising:
a power ratio receiving unit for receiving together, from one cell, respective information about a power ratio between a power of a common control physical channel used for multicasting or broadcasting said multimedia data in each of given cells and a power of a common pilot channel used for transmitting an information on reference of timing in each of the given cells;
a service information receiving unit of receiving service information indicating a state of an MBMS service in each of the given cells;
a ranking unit for ranking the plurality of cells on the basis of the information about said power ratio in each of the given cells, which is received by said power ratio receiving unit, and the power of said common pilot channel; and
a cell selecting unit of acquiring a set including a plurality of cells from which the mobile station can receive an MBMS on the basis of the information about the ranking determined by said ranking unit and a predetermined threshold, and said service information received by said service information receiving unit.
2. A base station which can be used for providing a multimedia broadcast multicast service (MBMS) of multicasting or broadcasting a multimedia data to a plurality of mobile stations in a communications system, said base station comprising:
a power ratio transmitting unit for transmitting together, from one cell, respective information about a power ratio between a power of a common control physical channel used for multicasting or broadcasting said multimedia data in each of given cells and a power of a common pilot channel used for transmitting an information on reference of timing in each of the given cells; and
a service information transmitting unit for transmitting service information indicating a state of an MBMS service in said each of the given cells,
wherein said base station transmits the information about said power ratio and said service information to said mobile station in order to enable a mobile station which will receive the information about said power ratio and said service information to determine a ranking of the plurality of cells on the basis of the information about said power ratio in each of the given cells and the power of said common pilot channels, and enable the mobile station to determine a set including a plurality of cells from which a mobile station can receive an MBMS on the basis of the determined ranking and a predetermined threshold, and said service information. Beschreibung
CROSS REFERENCE TO RELATED APPLICATIONS This application is a divisional application of U.S. Ser. No. 10/582,955 filed Jun. 15, 2006, which is the National Stage of International Application No. PCT/JP04/04502 filed Mar. 30, 2004. The entire content of U.S. Ser. No. 10/582,955 is incorporated herein by reference.
FIELD OF THE INVENTION The present invention relates to a mobile communications terminal and a radio communications system which, when receiving multimedia data transmitted from a base station using a CDMA (Code Division Multiple Access) method, can improve the reception quality of the multimedia data.
BACKGROUND OF THE INVENTION Related art radio communications systems are based on the premise that there is a one-to-one correspondence between base stations and mobile communications terminals (e.g., mobile phones and mobile PCs), and therefore do not support services of transmitting data to two or more mobile communications terminals simultaneously using a base station. There is a previously known method of notifying broadcast information from a base station to all mobile communications terminals in the control area of the base station all at once using a common channel. However, this method is aimed at notifying information about control to all mobile communications terminals in the control area all at once, but is not aimed at transmitting data, such as audio data and image data, to all mobile communications terminals in the control area all at once.
[Patent reference 1] JP,2003-188818,A [Nonpatent reference 1] 3GPP Standardization Document R1-031103 Selective Combining for MBMS A problem with related art radio communications systems constructed as mentioned above is that while a base station can secure the reception quality of each mobile communications terminal staying in the control area thereof by controlling its transmission power so that the mobile communications terminal which has the smallest reception power in all the mobile communications terminals which are staying in the control area thereof will have reception power exceeding reference power, an increasing of the transmission power assigned to the S-CCPCH may degrade the reception quality of information transmitted to a mobile communications terminal using another channel since the transmission power assigned to the other channel becomes low relatively.
DISCLOSURE OF THE INVENTION In accordance with the present invention, there is provided a mobile communications terminal including: a maximum-ratio-combining means for dividing a plurality of multipath signals associated with radio signals transmitted from a plurality of base stations using a common channel into groups by base station, i.e., by transmit source, and for maximum-ratio-combining a plurality of multipath signals associated with each same base station which is a transmit source into a composite signal; and a decoding means for decoding the composite signal outputted from the maximum-ratio-combining means, the mobile communications terminal selecting a composite signal having a good decoded result from among composite signals decoded by the decoding means.
In accordance with the present invention, there is also provided a mobile station which can receive a multimedia broadcast multicast service (MBMS) of multicasting or broadcasting a multimedia data to a plurality of mobile stations in a communications system, said mobile station comprising: a power ratio receiving unit for receiving information about a power ratio between a power of a common control physical channel used for multicasting or broadcasting said multimedia data in each of given cells and a power of a common pilot channel used for transmitting an information on reference of timing in each of the given cells; a service information receiving unit of receiving service information indicating a state of an MBMS service in each of the given cells; a cell selecting unit of acquiring a set including a plurality of cells from which a mobile station can receive an MBMS on the basis of the information about said power ratio which is received by said power ratio receiving unit, and said service information received by said service information receiving unit; and a ranking unit for ranking the plurality of cells on the basis of the information about said power ratio in each of the given cells, which is received by said power ratio receiving unit, and the power of said common pilot channel, and wherein said cell selecting unit determines the plurality of cells included in said set on the basis of the ranking determined by said ranking unit and a predetermined threshold.
In accordance with the present invention, there is also provided a base station which can be used for providing a multimedia broadcast multicast service (MBMS) of multicasting or broadcasting a multimedia data to a plurality of mobile stations in a communications system, said base station comprising: a power ratio transmitting unit for transmitting information about a power ratio between a power of a common control physical channel used for multicasting or broadcasting said multimedia data in each of given cells and a power of a common pilot channel used for transmitting an information on reference of timing in each of the given cells; and a service information transmitting unit for transmitting service information indicating a state of an MEMS service in said each of the given cells, wherein said base station transmits the information about said power ratio and said service information to said mobile station in order to enable a mobile station which will receive the information about said power ratio and said service information to acquire a set including a plurality of cells from which said mobile station can receive an MBMS on the basis of the information about said power ratio and said service information, and in order to enable said mobile station which will receive the information about said power ratio to determine a ranking of the plurality of cells on the basis of the information about said power ratio in each of the given cells and the power of said common pilot channel, and to enable the mobile station to determine the plurality of cells included in said set on the basis of the determined ranking and a predetermined threshold, said base station transmits the information about said power ratio in each of the given cells to said mobile station.
BRIEF DESCRIPTION OF THE FIGURES FIG. 1 is a block diagram showing a radio communications system in accordance with embodiment 1 of the present invention;
Embodiment 1 FIG. 1 is a block diagram showing a radio communications system in accordance with embodiment 1 of the present invention, and, in the figure, a service center 1 stores contents for delivery and delivers the contents. A GGSN (Gateway GPRS Support Node) 2 is a gate with an external network (e.g., the Internet network) which serves as a gateway with the outside of the radio communications system, and secures a path (path) via which packets are passed. The GGSN also carries out processes including collection of accounting information, mobility management, QoS (Quality of Service) negotiation, and policy control for adjusting traffic. An SGSN (Service GPRS Support Node) 3 takes charge of packet communications, and deals with authentication about each user, service subscription, routing, management of mobility, service restrictions, context storage, accounting information, etc.
FIG. 4 is a block diagram showing each base control apparatus in accordance with embodiment 1 of the present invention. In the figure, a transmit-receive processing unit for core network carries out communications protocol processes, such as a process about a protocol for use with the core network, such as RANAP (Radio Access Network Application Protocol), and a process about a protocol for use with other base control apparatus, such as RNSAP (Radio Network Subsystem Application Part).
To be more specific, since the multipath signal varies under the influence of fading as the mobile communications terminal 6 moves, the search unit 15 sets a code, timing, and so on for the S-CCPCH and searches for the S-CCPCH (in step ST1), and calculates a delay profile and so on for the searched S-CCPCH (i.e., the S-CCPCH associated with the base station A or S-CCPCH associated with the base station B) (in step ST2).
When receiving the composite signal selected by the selecting unit 22, the downlink common channel receiving unit outputs the selected composite signal to the protocol processing unit 26 if the composite signal is control information, whereas it outputs the selected composite signal to the application processing unit 27 if the composite signal is application data.
Embodiment 2 In accordance with above-mentioned embodiment 1, the selecting unit 22 selects a composite signal having a good decoded result from decoded composite signal A and B respectively stored in the cell output memories 21 a and 21 b, and outputs the selected composite signal to the downlink common channel receiving unit 23, as previously mentioned. As an alternative, the selecting unit 22 can check to see whether the decoded composite signal A stored in the cell output memory 21 a has a good decoded result, for example, as shown in FIG. 9, and, when determining that the decoded result is good, can output the decoded composite signal A to the downlink common channel receiving unit 23 without checking to see whether the decoded composite signal B stored in the cell output memory 21 b has a good decoded result (in steps ST17 and ST18). When determining that the decoded result of the decoded composite signal A stored in the cell output memory 21 a is not good, the selecting unit 22 further checks to see whether or not the decoded result of the decoded composite signal B stored in the cell output memory 21 b is good, and, when determining that the decoded result is good, outputs the decoded composite signal B to the downlink common channel receiving unit 23.
Embodiment 3 In above-mentioned embodiment 1, the example in which the active set includes only the base stations A and B is shown. There can be provided an update request means for comparing the reception levels of radio signals transmitted from a plurality of base stations 5 with one another, and for transmitting a request to update the active set according to the result of the comparison.
When the base station control apparatus 4 permits the addition of a base station to the active set, the base station transmits addition permission signaling indicating permission to add a base station to the active set (including the S-CCPCH parameters of the base station 5 which is permitted to be newly added to the active set) to the mobile communications terminal 6 using a DPCH which is a dedicated channel.
When the base station control apparatus 4 permits the deletion of a base station from the active set, the base station transmits deletion permission signaling indicating permission to delete a base station from the active set to the mobile communications terminal 6 using a DPCH.
When the antenna 11 receives the deletion permission signaling indicating a permission to delete a base station from the active set which is transmitted from the base station 5, and the protocol processing unit 26 of the mobile communications terminal 6 then receives the deletion permission signaling from the downlink dedicated channel receiving unit 25 in the same way as previously mentioned in embodiment 1 (in step ST52), the protocol processing unit 26 determines whether or not the deletion of a base station from the active set has been permitted by analyzing the deletion permission signaling (in step ST53).
Embodiment 4 In accordance with above-mentioned embodiment 3, each mobile communications terminal 6 compares the reception levels of radio signals transmitted from a plurality of base stations 5, and transmits a request to update the active set to a base station 5 according to the result of the comparison, as previously explained. Each mobile communications terminal 6 can alternatively include a monitor target updating means for, when updating the active set, receiving required broadcast information from a base station 5, and for referring to the broadcast information to update the active set, thereby eliminating the participation of base stations 5 in the updating of the active set. The search unit 15 and protocol control unit 26 of FIG. 2 constitute the monitor target updating means.
When receiving the broadcast information from the base station 5 (in step ST73), the mobile communications terminal refers to the broadcast information and then sets the information (e.g., the threshold) required for the updating of the active set (in step ST73).
The protocol processing unit 26 then adds the base station corresponding to the S-CCPCH parameters to the active set (in step ST88).
Embodiment 5 In accordance with above-mentioned embodiment 3, each mobile communications terminal 6 compares the reception levels of radio signals transmitted from a plurality of base stations 5, and transmits a request to update the active set to a base station 5 according to the result of the comparison, as previously explained. When comparing the reception levels of radio signals transmitted from a plurality of base stations 5, each mobile communications terminal 6 can estimate the reception levels of the radio signals as follows.
INDUSTRIAL APPLICABILITY As mentioned above, the radio communications system in accordance with the present invention is suitable for a case where when a plurality of base stations broadcast multimedia data to mobile communications terminals using S-CCPCHs, each mobile communications terminal needs to select a base station from which it can receive the multimedia data optimally to improve the reception quality of the multimedia data.
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