EP0744840A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
CDMA receiver with reduced power consumption in intermittent state
Assignee: Sony Corp
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Filing: 1996-05-23
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Granted: —
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Expires: 2016-05-23
Abstract
Abstract A communication terminal in which the power consumption in an intermittent reception can be reduced magnificently. The state value of second spread code generating means (62) for next drive is set to register means (73) to operate timer (70), and first and second spread code generating means (62, 75) and receiving circuit are stopped to enter a sleep state. Then, if they are driven again by the timeout of timer, the receiving circuit is operated and the second spread code generating means is operated from the state value which has been set to the register means. Further, the intermittent receiving means (65) for operating the first spread code generating means from an initial state is provided. Therefore, in non-reception, the first and second spread code generating means can be stopped, so that the power consumption in an intermittent reception can be reduced magnificently.
Inventors
- 👤 Takehiro Sugita
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 20:56
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/02; H04B; H04B1/00; H04B1/69; H04B1/707; H04W88/00; H04W88/02; H04B1/06; H04B1/16; H04B1/1607; H04B1/1615
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
205 words
A communication terminal in a communication system using code division multiple access (CDMA) technique which uses a first spread code generated by a first spread code generating circuit and a second spread code, having the longer code interval than that of said first spread code, generated by a second spread code generating circuit, and which performs an intermittent call reception for call acquirement, said communication terminal comprising: intermittent reception controlling circuit for performing a sleep mode and active mode wherein a receiving circuit and said first and second spread code generating circuits for receiving a calling party's call is inactive in said sleep mode and be active in said active mode conversely; a timer for use in selecting said sleep/active mode; and a register for storing a state value of said second spread code generating circuit for next driving condition thereof, whereby changeover from said sleep mode to active mode according to said timer makes said receiving circuit and said first and second spread code generating circuits active and said first spread code generating circuit is operated from the initial state thereof and said second spread code generating circuit is operated from the state which is based upon the state value stored in said register.
Claim 2
Dependent Claim
51 words
The communication terminal according to claim 1, wherein said intermittent call reception controlling circuit drives the receiving circuit at a timing being offset for a regular time from the head of said first spread code, with the period of the intermittent call reception being the integer times said first spread code.
Claim 3
Dependent Claim
70 words
The communication terminal according to claim 1 or 2 wherein said intermittent reception controlling circuit periodically reads out the state value of said second spread code generating circuit from said second spread code generating circuit with intervals of the integer times the period of said first spread code, and then the state value of said second spread code generating circuit for next drive is calculated from said read state value.
Claim 4
Dependent Claim
66 words
The communication terminal according to claim 1, 2 or 3 wherein said intermittent reception controlling circuit periodically updates the state value of said second spread code generating circuit with intervals of the integer times the period of said first spread code by a control software, and the state value of said second spread code generating circuit for next drive is calculated from said updated state value.
Claim 5
Dependent Claim
67 words
The communication terminal according to claim 1, 2, 3 or 4 wherein said second spread code generating circuit, which has the enable function and the load function for loading the state value at a predetermined timing, loads the state value supplied from outside in accordance with the timeout of said timer means and simultaneously makes it to be an enable state to generate said second spread code.
Claim 6
Dependent Claim
152 words
A communication terminal in a communication system using the code division multiple access (CDMA) which uses a first spread code and a second spread code having the longer code interval than that of said first spread code, and which performs the intermittent call reception for call acquirement, said communication terminal comprising: a timer for performing the intermittent call reception using a receiving circuit of said communication terminal being a sleep state or an active state at predetermined time intervals; a memory circuit for previously storing the state value of said second spread code used in the next intermittent call reception; and an intermittent reception controlling circuit for use in generating a second spread code based on the state value stored in said memory circuit and generating a first spread code based upon the initial state value thereof when the receiving circuit of said communication terminal becomes an active state by said timer.
Claim 7
Dependent Claim
58 words
The communication terminal according to claim 6, wherein: the period of said intermittent call reception is the integer times the period of said first spread code; and said intermittent reception controlling circuit makes the receiving circuit to be an active state at a timing being offset for a regular time from the head of said first spread code.
Claim 8
Dependent Claim
62 words
The communication terminal according to claim 6 or 7, wherein said intermittent reception controlling circuit periodically reads the state value of said second spread code with time intervals of the integer times the period of said first spread code, and obtains the state value of said second spread code used for the next call reception to store it in said memory circuit.
Claim 9
Dependent Claim
69 words
The communication terminal according to claim 6, 7 or 8, wherein said intermittent reception controlling circuit periodically updates the state value of said second spread code with time intervals of the integer times the period of said first spread code by a control software, so as to obtain the state value of said second spread code used for the next call reception to store it in said memory circuit.
Claim 10
Dependent Claim
179 words
A communication method in a communication system using the code division multiple access (CDMA) which uses a first spread code and a second spread code having the longer code interval than that of said first spread code, and which performs intermittent call reception to acquire a call from a calling party, said communication method comprising the steps of: performing the call reception by a timer which is used to place the receiving circuit of said communication terminal in a sleep state or in an active state at predetermined time intervals; previously storing the state value of said second spread code used in the next call reception in a memory circuit; and generating by an intermittent reception controlling circuit a second spread code based on the state value of a second spread code which has been stored in said memory circuit when the receiving circuit of said communication terminal becomes an active state by said timer, and generating by an intermittent reception controlling circuit a first spread code based on the initial state value to perform the intermittent call reception.
Claim 11
Dependent Claim
59 words
The communication method according to claim 10, wherein: the period of said intermittent call reception is the integer times the code interval of said first spread code; and said intermittent reception controlling circuit makes the receiving circuit to be an active state at a timing being offset for a regular time from the head of said first spread code.
Claim 12
Dependent Claim
62 words
The communication method according to claim 10 or 11, wherein said intermittent reception controlling circuit periodically reads the state value of said second spread code with time intervals of the integer times the period of said first spread code, and obtains the state value of said second spread code used for the next call reception to store it in said memory circuit.
Claim 13
Dependent Claim
69 words
The communication method according to claim 10, 11 or 12, wherein said intermittent reception controlling circuit periodically updates the state value of said second spread code with time intervals of the integer times the period of said first spread code by a control software, so as to obtain the state value of said second spread code used for the next call reception to store it in said memory circuit.
References Cited (Backward Citations)
No citation records indexed.
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