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EP-3407506-B1 - WIRELESS COMMUNICATION SYSTEM USING MULTIPLE TRANSMISSION AND RECEPTION POINTS

EP3407506B1EP 3407506 B1EP3407506 B1EP 3407506B1EP-3407506-B1

Inventors

  • KO, YOUNG-JO
  • NOH, TAE-GYUN
  • LEE, HEE-SOO
  • SEO, BANG-WON
  • AHN, JAE-YOUNG

Dates

Publication Date
20260506
Application Date
20120210

Claims (6)

  1. A method of wireless communication, the method comprising: scrambling, by a base station, first bits of first downlink control information using a first scrambling sequence generated based on at least a physical cell identity, PCI, to generate first scrambled bits of the first downlink control information; transmitting, by the base station, the first scrambled bits of the first downlink control information through a first control channel; scrambling, by the base station, second bits of second downlink control information using a second scrambling sequence generated based on at least a virtual cell identity, VCI, to generate second scrambled bits of the second downlink control information; transmitting, by the base station, the second scrambled bits of the second downlink control information through a second control channel, wherein the first control channel is a Physical Downlink Control Channel, PDCCH, and the second control channel is a new physical channel capable of performing a function of the PDCCH.
  2. The method of claim 1, wherein the second control channel exists at a region of a Physical Downlink Shared Channel, PDSCH.
  3. The method of claim 1, further comprising: generating first UE, User Equipment,-specific reference signals at least based on the PCI in the first control channel; and generating second UE-specific reference signals at least based on the VCI in the second control channel.
  4. A communication apparatus, comprising: a memory; and a processor operably coupled to the memory, wherein the processor, when executing the program instructions stored in the memory, is configured to: scramble first bits of first downlink control information using a first scrambling sequence generated based on at least a physical cell identity, PCI, to generate first scrambled bits of the first downlink control information; cause the apparatus to transmit the first scrambled bits of the first downlink control information through a first control channel; scramble second bits of second downlink control information using a second scrambling sequence generated based on at least a virtual cell identity, VCI, to generate second scrambled bits of the second downlink control information; cause the apparatus to transmit the second scrambled bits of the second downlink control information through a second control channel, wherein the first control channel is a Physical Downlink Control Channel, PDCCH, and the second control channel is a new physical channel capable of performing a function of the PDCCH.
  5. The apparatus of claim 4, wherein the second control channel exists at a region of a Physical Downlink Shared Channel, PDSCH.
  6. The apparatus of claim 4, wherein the processor is further configured to: generate first UE, User Equipment,-specific reference signals at least based on the PCI in the first control channel; and generate second UE-specific reference signals at least based on the VCI in the second control channel.

Description

[Technical Field] The present invention relates to a wireless communication system, and more particularly, to a wireless communication system that uses multiple transmission/reception points and can be applied to a wireless communication system having a plurality of transmission/reception points geographically spaced apart from each other in a cell. [Background Art] Data transmission rates of wireless communication systems are becoming very high along with those of wired communication systems. With such a current trend, standardization of a Coordinated MultiPoint (CoMP) transmission/reception method is under way for a Third Generation Partnership Project (3GPP) Long Term Evolution (LTE) system, which is a fourth generation mobile communication system. The CoMP transmission/reception method relates to transmission/reception operations between at least two points (site, cell, base station, distributed antenna, etc.) and at least one terminal, and can be divided into uplink CoMP transmission and downlink CoMP transmission. Uplink CoMP transmission is a transmission method in which a predetermined terminal transmits a signal to a plurality of points geographically spaced apart from each other, and the plurality of points perform joint-processing of the signal received from the terminal. In uplink CoMP transmission, the terminal does not need to know from which network node the signal has been transmitted, or what kind of processing has been performed on the received signal, and only needs to know what kind of downlink signaling is provided in relation to the uplink transmission. Thus, uplink CoMP transmission can be employed with no significant change in the standard of a wireless interface. Downlink CoMP transmission is a method in which a plurality of points geographically spaced apart from each other cooperatively transmit a signal to at least one terminal. In 3GPP technical report (TR) 36.814, a downlink CoMP category is divided into joint processing (JP) and coordinated beamforming/coordinated scheduling (CB/CS), and JP is divided again into joint transmission (JT), in which multiple points simultaneously perform physical downlink shared channel (PDSCH) transmission, and dynamic point selection (DPS), in which one point performs PDSCH transmission. JT uses the concept of distributed antennas in which each transmission point of a CoMP cooperating set can use data. In JT, accurate information on a wireless channel is required, and performance easily varies with delay, an estimation error, and so on. DPS is a method, where one point of a CoMP cooperating set performs PDSCH transmission at a specific moment. In DPS, a transmission point may dynamically vary, and performance may deteriorate due to feedback delay. CB/CS is a method, where for only a serving point transmits data to a terminal at a specific moment. Since CB/CS is a passive method for avoiding interference between transmission points, it is not expected to give a large capacity increase. Also, when user scheduling/beamforming requires information exchange between different base stations for cooperation between points corresponding to a CoMP cooperating set, a backhaul may be used for information exchange between the different base stations. Meanwhile, in the 3GPP LTE Release-8 and Release-9 and LTE-Advanced Release-10 standards, all transmission points generally have different physical cell identities (PCIs). Thus, when the aforementioned transmission methods using multiple points are applied to the standards, transmission using multiple points will be performed in an environment in which respective transmission points have individual cell coverage - see also WO 2010/068011 A2 (LG ELECTRONICS INC [KR]; KIM BONG HOE [KR]; NOH YU JIN [KR]; LEE DAE W) 17 June 2010. For this reason, the existing standards cannot be applied to a multipoint transmission environment in which a plurality of points belong to the same cell and have the same PCI. [Disclosure] [Technical Problem] The present invention is directed to providing a wireless communication system that uses multiple transmission/reception points and enables communication using a plurality of points in a network environment in which the plurality of points belong to the same cell and have the same physical cell identity (PCI). [Technical Solution] One aspect of the present invention provides a wireless communication system using multiple transmission/reception points and including a first transmission/reception point and at least one second transmission/reception point belonging to the same cell, wherein the first transmission/reception point has wider transmission coverage than the at least one second transmission/reception point, and the first transmission/reception point and the at least one second transmission/reception point generate a downlink transmission signal using the same physical cell identity (PCI). Here, the first transmission/reception point may transmit a synchronization signal and a