TERMINAL APPARATUS, BASE STATION APPARATUS, PILOT TRANSMITTING METHOD, AND PROPAGATION PATH ESTIMATING METHOD

• US 20130010833A1
• Filed: 03/17/2011
• Published: 01/10/2013
• Est. Priority Date: 03/29/2010
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Ogawa, Yoshihiko, Iwai, Takashi, Nishio, Akihiko, Nakao, Seigo
• Granted Patent: US 8,644,361 B2
• Time in Patent Office: Days
• US Class Current: 375/138
• CPC Class Codes: H04B 2001/6904 using code hopping
• CPC Class Codes: H04J 11/0023 Interference mitigation or co-ordination direct sequence spread spectrum [DSSS] systems H04B1/7097; frequency hopping H04B1/713; allocation criteria for ingress interference avoidance H04L5/0062; frequency allocation criteria for requirements on out-of-channel emissions H04L5/0066; arrangements for removing intersymbol interference or baseband equalisers H04L25/03006; peak power aspects in multicarrier modulation H04L27/2614; power management H04W52/00; traffic scheduling H04W72/54, H04W72/541
• CPC Class Codes: H04J 13/0059 CAZAC [constant-amplitude and zero auto-correlation]
• CPC Class Codes: H04J 13/0074 Code shifting or hopping
• CPC Class Codes: H04W 72/044 based on the type of the allocated resource

Abstract

Provided is a terminal apparatus that can suppress the increase in interference between pilot signals in the same slot, while also suppressing the degradation of the flexibility to design cell cluster structures. When hopping information indicates an inter-slot hopping, a mapping unit (212) arranges a first pilot sequences in which a group to which the sequences used in respective slots belong varies on a slot-by-slot basis. When the hopping information indicates an inter-subframe hopping, the mapping unit (212) arranges a second pilot sequences in which a group to which the sequences used in respective slots belong varies on a subframe-by-subframe basis. The sequence group to which the sequences used in any one of the subframes in the second pilot sequences belong is identical with the sequence group to which the sequence used in any one of the slots included in that one subframe in the first pilot sequences belongs.

Claims

1. A terminal apparatus comprising:

a reception section configured to receive a control signal including hopping information;

a generation section configured to generate a first pilot sequence in a group to which a sequence used in each slot belongs changes on a slot basis, when the hopping information indicates inter-slot hopping, and generate a second pilot sequence in a group to which a sequence used in each slot belongs changes on a subframe basis, when the hopping information indicates inter-subframe hopping; and

a transmission section configured to transmit a signal including the first pilot sequence or the second pilot sequence generated by the generation section,

wherein a sequence group to which a sequence used in any subframe belongs in the second pilot sequence is identical to a sequence group to which a sequence used in any one of the slots included in the subframe belongs in the first pilot sequence.

2. The terminal apparatus according to claim 1, wherein:

the number of allocation resource blocks is associated with a plurality of sequences in the group; and

the first pilot sequence and the second pilot sequence to be generated by the generation section use different sequences in the plurality of sequences.

3. The terminal apparatus according to claim 2, wherein the plurality of sequences are each a sequence whose u/N value is closest to a reference value or a sequence whose u/N value is second closest to a reference value, where u is a sequence index and N is a sequence length.

4. The terminal apparatus according to claim 1, wherein a sequence group used in any subframe included a first frame in the second pilot sequence is identical to a sequence group to which a sequence used in a first slot included in the subframe belongs in the first pilot sequence, and a sequence group used in the corresponding subframe included a second frame consecutive to the first frame is identical to a sequence group to which a sequence used in a second slot included in the subframe belongs in the first pilot sequence.

5. A base station apparatus comprising:

a setting section configured to set a hopping type of a pilot signal for a terminal, the pilot signal being transmitted by the terminal; and

an estimation section configured to perform channel estimation between the terminal and the base station apparatus using a first pilot sequence in a group to which a sequence used in each slot belongs changes on a slot basis, when the set hopping type is inter-slot hopping, and performs channel estimation between the terminal and the base station apparatus using a second. pilot sequence in a group to which a sequence used in each slot belongs changes on a subframe basis, when the set hopping type is inter-subframe hopping,

wherein a sequence group to which a sequence used in any subframe belongs in the second pilot sequence is identical to a sequence group to which a sequence used in any one of slots included in the subframe belongs in the first pilot sequence.

6. The radio base apparatus according to claim 5, wherein:

the number of allocation resource blocks is associated with a plurality of sequences in the group; and

the first pilot sequence and the second pilot sequence to be used in the estimation section use different sequences in the plurality of sequences.

7. The radio base apparatus according to claim 6, wherein:

the plurality of sequences are each a sequence whose u/N value is closest to a reference value or a sequence whose u/N value is second closest to a reference value, where u is a sequence index and N is a sequence length.

8. The radio base apparatus according to claim 7, wherein a sequence group used in any subframe included a first frame in the second pilot sequence is identical to a sequence group to which sequence used in a first slot included in the subframe belongs in the first pilot sequence, and a sequence group used in the corresponding subframe included a second frame consecutive to the first frame is identical to a sequence group to which a sequence used in a second slot included in the subframe belongs in the first pilot sequence.

9. A pilot transmitting method comprising the steps of:

receiving a control signal including hopping information;

generating a first pilot sequence in a group to which a sequence used in each slot belongs changes on a slot basis, when the hopping information indicates inter-slot hopping, and generating a second pilot sequence in a group to which a sequence used in each slot belongs changes on a subframe basis, when. the hopping information indicates inter-subframe hopping; and

transmitting a signal including the generated first pilot, sequence or the generated second pilot sequence,

wherein a sequence group to which a sequence used in any subframe belongs in the second pilot sequence is identical to a sequence group to which a sequence used in any one of the slots included in the subframe belongs in the first pilot sequence.

10. A channel estimating method comprising the steps of:

setting a hopping type of a pilot signal for a terminal, the pilot signal being transmitted by the terminal; and

performing channel estimation using a first pilot sequence in a group to which a sequence used in each slot belongs changes on a slot basis, when the set hopping type is inter-slot hopping, and performing channel estimation using a second pilot sequence in a group to which a sequence used in each slot belongs changes on a subframe basis, when the set hopping type is inter-subframe hopping,

wherein a sequence group to which a sequence used in any subframe belongs in the second pilot sequence is identical to a sequence group to which a sequence used in any one of slots included in the subframe belongs in the first pilot sequence.